The architecture should be considered in light of modern neuroscience research. The powerful influence of light on brain neurotransmitters adjust the attention, mood and behavior and affect safety and work performance.
Influence of lighting in the workplace.
The city dwellers spend up to 80% of the time in closed environments, housing, transportation or work, some opaque enclosures with little or no sunlight. The optics have long known that light affects the visual acuity and color perception. Today the state of neuroscience research to suggest that light is Biodine &nt.
light call light to the spectrum of electromagnetic radiation as perceived by the human. Includes infrared light, which we recognize as heat, the entire visible spectrum, with the seven colors of the rainbow and ultraviolet rays, responsible among other beneficial effects of tanning. Visible radiation, between 400 and 720 nm (1 nm = 1x10-9 m), are particularly perceived by humans because of these sensors are wonderful eyes. Our retina is thousands of times more sensitive than the skin sensors, which also responds to the invisible bands of light, infrared and ultraviolet light.
minimum lighting intensity We need a bright light, minimum intensity between 800 and 1000 lux, which tells the nervous system that it is day, and awakens us mood, without chemical stimuli such as coffee or snuff. Photobiology tells us that the perception of bright light in the pineal gland, inhibits the secretion of melatonin, the sleep hormone, and provides the brain serotonin, the hormone activity. Generally
minimum illumination is calculated to allow readability. In the amblowing are common work intensities from 100 to 200 lux in hallways, and 300 to 500 lux in offices. Inadequate lighting levels can not overcome the drowsiness and be mentally awake and alert.
contrast abroad are from 10,000 lux on a cloudy day, up to 150,000 lux at midday in midsummer. We all perceive the injection of vital energy that is captured to go outside when the sun's rays bathe our skin. The sun looking for something more than a fashionable tan.
reactor, magnetic and stress batteries have a frequency fluorescentence of 50 Hz is blinking press stress induces brain waves, Beta waves, in addition to physical fatigue, headaches and eyestrain. Stress causes an excessive secretion of cortisol in the brain, killing millions of neurons. The reactors also produce radio interference, disrupting telecommunications and computer systems, and cause major pollution electromagnetic (elektrosmog), which affects health.
The high-frequency electronic ballasts, which vibrate at 20,000 Hz, eliminate eye fatigue and stress to prevent flickering of the tube, since it fails to shut down completely.They also produce an instant-on, to dispense with primers and capacitors, save energy, extend the life of the tubes and remove elektrosmog.
Color and full spectrum lighting.
The lighting used since Edison's incandescent lamp. The filament emits a warm light with a color profile which dominate the yellow-orange-red, with no high-frequency tones, green, blue and violet. They are also both traditional incandescent standard lamps, such as sodium vapor lamps and mercury or modern dichroic andhalogen.
fluorescent light normally used, gives a light cold, bluish-green cast, is deficient in the blue-violet and orange-red. The use of fluorescent tubes is widespread in energy savings, the predominance of fluorescent batteries work environment is one of the sick building illnesses. There are different shades, cool white, warm white, deluxe, which improve the visual impact, but do not have a full color spectrum. Instead
modern fluorescent lamps FULLSPECTRUM produce a pure white light, with all the rainbow colors, similar to sunlight, which permitsulan activity. By contrast, in the absence of light stimuli, increases melatonin which induces sleep. The lack of natural light rhythm, melatonin cycle alters serotonin, causing morning drowsiness and insomnia at night. 30% of world population, mostly in developed countries suffers from chronic insomnia.
The amount of light affects us as shown by the SAD. At the beginning of winter, almost like a hibernation, the TAE produces apathy, excessive appetite and depression because of low winter light, was discovered by Dr. Rosenthal in 1981. In winter there is less natural light, due to cold, we m & aacutcircadian rhythm sleep, including delayed sleep type, jet-lag and shift caused by the shift.
Research conducted since 1990 by neuroscientist Roa, in the R & D colorsystem, confirmed that a better use of light in the blue-violet and orange-red. Stimuli with full spectrum lighting and color filters allow an improvement of distance visual acuity, less diopters in 95% of cases, and better control of the alpha activation cycle, with improvement of cognitive-perceptual process, achieving higher academic performance and work.
These constants psychobiologicalas alertness and attention, can be evaluated quantitatively by visual test, noninvasive, determining an individual's work performance.
Architecture
light design environment must be considered by both the cycle time and the amount of light, the light biodynamic, according to environment and climate. But it must also studied the quality of that light, especially its color, and also the contrast and spatial distribution, according to ergonomics, as the use of each space.
Most architects and interior designers do not consider sufficiently the impact that
Monday, November 23, 2009
Sunday, November 22, 2009
Skin Breakout And Breast Cancer Histria some of the theories of light
WHAT IS THE LIGHT? : HISTORY OF THE THEORIES ON THE NATURE OF LIGHT
(First published in "Revista Universitaria-UABC No. 50, April-June 2005) Lydia Alvarez Camacho Guadalupe
Institute of Engineering, UABC
Jesus M. Beltrones Siqueiros
Center Condensed Matter Science, UNAM
Illustrations: Ernesto Anguiano Israel Santillan
The Greeks asked how did we see?
How do we see? This is an interesting question for all human beings. Today
days, to answer, we are fortunate to have information
accumulated over thousands of years. Back in 500 BC, at the time of the heyday of Greek culture, this was not true. In that
its
form. This theory is called extramisión. Leucippus, however believed that the approach
occurred in the opposite direction. Emitting objects "something" that contained his form and color, and
falling on the eyes, which did nothing but catch it. This theory is called interference.
Since we can not see without light, it was assumed that these fumes could not exist in the dark but not
Empedocles, Leucippus could not say anything about its nature. However,
was something quite clear: the emanations or "rays" travel in a straight line. This makes
its spread can be studied using the laws of geometry. No wonder that
Euclid, the father of traditional or Euclidean geometry,write a book on the subject,
which establishes the basis of perspective, a technique still used today
designers and artists worldwide.
was many years later when he settled the old debate
extramisión against intrusion. The manager of this was Alhazen, Arab physician born in what is now Iraq. Taking
among other things that look directly at the sun hurts his eyes,
rightly concluded that the eyes are receivers and not transmitters. Also correct in explaining that an object receives
ambient light and scattered in all directions. In the absence of obstacles, this
scattered light propagates in the eye and the sensation of the object. If no light, objects can
A s the father of physics. However, their
theories of light, never had the same level as the rest of his work. Despite this, many think tanks, uncritical reading of the texts of Aristotle were replaced by the uncritical reading of the texts of Newton. This fact plays a significant role in the story we tell below.
Newton says the light is made up of particles
got Newton's laws explain many phenomena, it was easy to exaggerate and
think they could explain them all. In this context, Isaac Newton explained the nature of light, whereas
consists of small balls, in what is known as
corpuscular theory or issue. The movement and
ARRIERS should only stop some of these and the projection of light on a screen would be simply a geometric shadow, as indeed for big hurdles. However, there was no way to explain why small obstacles as light deviates markedly from the straight path, or why the light projected onto a screen a complex diffraction pattern. Experiment
Young. Why in the region illuminated by two beams of light, there are areas
completely dark?
In particular, what was especially uncomfortable was that series of bright spots and dark
appeared in very specific orders. An experiment conducted in 1803 by Thomas Young
qWe call on all wave directions. If
consider the x-axis is the level of water in equilibrium, Figure 4 could be a fairly realistic scheme
one of these waves. A point where the water reaches its maximum height is a ridge
and one where it reaches its minimum height is a valley. The maximum distance
the height of the water can move away from its equilibrium position is called amplitude. The distance between peak and valley and ridge or between valley is called wavelength. It is important to note that although the wave is spreading horizontally, the water never moves in this direction. Water moves up or down when it leaves its equilibrium position, but once the shock returns to its pOn the other hand, if the direction of motion of the particle and the direction of propagation are the same, as in (b), we have a longitudinal wave. Figure 4 can be performed without any change to any transverse wave, and a little imagination can also be used to represent a longitudinal wave. The sum of waves
presents some interesting phenomena. When two waves are
do not necessarily coincide with the crests of the ridges of the other. If they do, they say they are in phase. If two waves with equal amplitude are in phase, the result is a wave with an amplitude twice as large as the original. This is called constructive interference. If there is this coincidence is said that the waves are fuand nothing to disturb, as in the empty space, sound can not propagate. Huygens
says the light is made of waves
At the time of the Greeks, the two main theories were based on an analogy between sight and touch. Many centuries later, the analogy between vision and hearing prompted many reflections. The sight and sound have in common that they function over long distances. The wave nature of sound was already well established. It was inevitable question would not be too light a wave? A Dutchman named Christian Huygens Firmat answered this question.
The ripples in the water are the most typical example of a wave. When considering light as a wave, Christian Huygens could explain the stripes on the expYoung erimento as a result of constructive and destructive interference between light traveling through different paths. In the wave theory of Huygens, the light intensity is related to the amplitude of the wave while the different colors correspond to different values of wavelengths, the color red has the longest wavelength, while the color Violet has the shortest. According to Huygens' principle, when light encounters an obstacle, every point it becomes a new source of wavelets that spread in all directions, hence no diffraction problems. These wavelets interfere with each other, resulting in preferential directions of propagation, such as those occurring in the phenomena of reflectionng and refraction.
The bands that appear in Young's experiment can be explained
directly as a result of constructive and destructive interference between two beams of light.
the same way, light and dark regions in a diffraction pattern,
explained as a result of interference between rays diffracted in different directions. More importantly, the Huygens principle to calculate, with extreme precision, the expected diffraction patterns for different obstacles.
In summary, we have that the wave theory can explain properties of light as
the intensity and color and phenomena such as reflection, refraction, as does the particle theory
. But alsocan not propagate in vacuum as the light it can?
Huygens's principle can explain this without problems, since it predicts that the diffraction
only be noticeable when the obstacle dimensions are similar to the wavelength. The wavelength of light is very small compared to
everyday objects, so in our daily life is very difficult to perceive it and therefore we
consider that light travels in straight lines. In contrast, the wavelength of the sound is much bigger, so it can be perceived diffraction and these allow us to hear portions diffracted despite not being in front of the sound source, or that we go through any obstacle.
The fact that they arehen appears a burden? The difference between "there is strength" and "if a charge, there would be a force" is radical. The mere possibility that at some point, a "burden of proof" to suffer a force field called Michael Faraday.
Some believe that philosophy is synonymous with wasting time. However, when the head of Michael Faraday came the concept of field, nobody could imagine how that would revolutionize science and our way of life.
Although the concept of field seems a pipe dream only convenient, Michael Faraday
insisted the reality of their existence. To Faraday, the field was a disturbance of space.
A charge produces an electric field and also occurs if you move orNo magnetic field. The
"test loads" move because of the effect of the field in which they are submerged and not due to
action at a distance from the other charge. For many, it was difficult to share the hallucinations of Faraday. The field did not seem to be something tangible, but a simple idea and assume that the ideas are part of reality, seemed a matter of ancient philosophies overcome. The reality was made things matter ... not concepts. So philosophers who sought to put both feet in reality are sometimes called, as in the expression "dialectical materialism, well known by those who have had contact with socialist literature. Electromagnetic waves
Despite its intangibility, the reality of the fields reconsultation to be as certain as the sun illuminates the earth
. When James Clerk Maxwell's equations examined
describing the interactions between electric and magnetic fields realized that predicted that a disruption
they may spread. A variation of the electric field would produce a variable magnetic field. The variation in the magnetic field is reflected in a new variation of the electric field, which in turn would cause a variation in the magnetic field. The electric and magnetic field, two disturbances of space, they propagate together in what would be an electromagnetic disturbance. The speed at which this disturbance would propagate through empty space to be strangely consultation rvery similar to the speed of light, which had been measured at the time. The conclusion was amazing, the light was nothing more than an electromagnetic wave.
already mentioned that the wavelength of light is small relative to the size of everyday objects
. The question now was: Will there be electromagnetic waves with wavelengths of other sizes? Hertz was able to generate electromagnetic waves with wavelengths much longer. These radio waves are used today to transmit radio and television, as its wavelength is large enough, can get around obstacles: we can pick up a radio signal even though we can not see station transmitting antenna. For longer or
nda slightly longer than the red color found
infrared rays, ultraviolet rays while having wavelengths slightly shorter than violet. Both infrared electromagnetic waves such as ultraviolet
have properties very similar to that of light, sometimes referred to as light. Due to this broadening of the concept, the interval between red and violet, which is what our eyes can perceive, is called visible light.
ultraviolet rays, X rays and gamma rays are just electromagnetic waves with wavelengths shorter than visible light.
X-rays, which have had a spectacular application in medicine and gamma rays that produce the elements
radioactive revealed nothing more than
electromagnetic waves of shorter wavelengths than light. Interestingly, the smaller the wavelength of an electromagnetic wave, the more likely it is harmful to living beings. It is necessary to use sunscreen to protect our skin from ultraviolet rays, X rays can not be used in pregnant women and accidents such as Chernobyl cause terrible damage due to, among other things, the gamma-ray emission.
One consequence of considering light as an electromagnetic wave is that the ether
longer necessary. The ether had played an important role in support of the theory
wave, but that role was now the concept of ccrumbs. The fields are disturbances
vacuum, and once accepted this need not conceive of a special material that can disturb electromagnetic wave
. However, the ether, like all old ideas are resisted
die. However, the successful failure of Michelson-Morley experiment, which aimed to detect the ether, and the subsequent development of the theory of relativity by Albert Einstein, killed, buried and prayed novena to the ever useful concept. But that's another story to be told another time. Wave-particle duality
far, the debate about the nature of light could be counted as if it were a soap opera. The evil with his absurd Newton corpuscular theoryr an explanation that even Maxwell's electromagnetic theory could give. One of these phenomena was the photoelectric effect.
In the photoelectric effect, light energy can be transferred to an electron depends
color. Electromagnetic theory says that the energy contained in light is related to the amplitude of the wave while the color is related to its wavelength. Nowhere electromagnetic theory proposes a relationship between energy and color. Thus, the photoelectric effect remained a mystery.
The solution to the puzzle was clever, but the physics had to take a small leap
ago. Albert Einstein said that the photoelectric effect could be explained easily ifnsferida the electron depends on the color of the light and not its intensity.
All electromagnetic waves can be understood as consisting of photons.
For very long wave lengths, the photons have very little power, so the concept is not useful. In contrast, for X rays and gamma rays, photons are highly energetic and its study is indispensable for understanding the increasingly wide variety of electromagnetic phenomena that the theory can not explain.
Despite the usefulness of the new concept, the photon seems to have revived the old corpuscular theory of Newton
. The obvious question was: Is light a wave or a particle? The
evidence in favor of electromagnetic theory do not disappearn reality, all are ondaspartículas, where they can sometimes dominate the wave properties and others, those of
particle. This concept led to the development of quantum mechanics.
say that idleness is the mother of all philosophies. The truth is that thanks to the work undertaken by the Greek philosophers, we now have a technology that frees us from repetitive work and allows us to have free time during which we can continue philosophizing.
The story is not finished being written
are resigned not all that easily. Designed experiments constantly with
purpose of determining whether the light is particle or wave back. One of these consisted of a repetition of the experiment of Young, but networkwere as powerful tools for technological development. However, we should not fall into the oft-repeated mistake of taking the latest theories known as absolute truth. The truth must be something much more complex and certainly in the future balguien venture to find a new way to explain all these phenomena, a new form, so clear and elegant, it gets to dismiss the current theories. Will this happen soon?
Will we have chance to see it? Who will be brave dare? Could it be perhaps ...
one of us?
(First published in "Revista Universitaria-UABC No. 50, April-June 2005) Lydia Alvarez Camacho Guadalupe
Institute of Engineering, UABC
Jesus M. Beltrones Siqueiros
Center Condensed Matter Science, UNAM
Illustrations: Ernesto Anguiano Israel Santillan
The Greeks asked how did we see?
How do we see? This is an interesting question for all human beings. Today
days, to answer, we are fortunate to have information
accumulated over thousands of years. Back in 500 BC, at the time of the heyday of Greek culture, this was not true. In that
its
form. This theory is called extramisión. Leucippus, however believed that the approach
occurred in the opposite direction. Emitting objects "something" that contained his form and color, and
falling on the eyes, which did nothing but catch it. This theory is called interference.
Since we can not see without light, it was assumed that these fumes could not exist in the dark but not
Empedocles, Leucippus could not say anything about its nature. However,
was something quite clear: the emanations or "rays" travel in a straight line. This makes
its spread can be studied using the laws of geometry. No wonder that
Euclid, the father of traditional or Euclidean geometry,write a book on the subject,
which establishes the basis of perspective, a technique still used today
designers and artists worldwide.
was many years later when he settled the old debate
extramisión against intrusion. The manager of this was Alhazen, Arab physician born in what is now Iraq. Taking
among other things that look directly at the sun hurts his eyes,
rightly concluded that the eyes are receivers and not transmitters. Also correct in explaining that an object receives
ambient light and scattered in all directions. In the absence of obstacles, this
scattered light propagates in the eye and the sensation of the object. If no light, objects can
A s the father of physics. However, their
theories of light, never had the same level as the rest of his work. Despite this, many think tanks, uncritical reading of the texts of Aristotle were replaced by the uncritical reading of the texts of Newton. This fact plays a significant role in the story we tell below.
Newton says the light is made up of particles
got Newton's laws explain many phenomena, it was easy to exaggerate and
think they could explain them all. In this context, Isaac Newton explained the nature of light, whereas
consists of small balls, in what is known as
corpuscular theory or issue. The movement and
ARRIERS should only stop some of these and the projection of light on a screen would be simply a geometric shadow, as indeed for big hurdles. However, there was no way to explain why small obstacles as light deviates markedly from the straight path, or why the light projected onto a screen a complex diffraction pattern. Experiment
Young. Why in the region illuminated by two beams of light, there are areas
completely dark?
In particular, what was especially uncomfortable was that series of bright spots and dark
appeared in very specific orders. An experiment conducted in 1803 by Thomas Young
qWe call on all wave directions. If
consider the x-axis is the level of water in equilibrium, Figure 4 could be a fairly realistic scheme
one of these waves. A point where the water reaches its maximum height is a ridge
and one where it reaches its minimum height is a valley. The maximum distance
the height of the water can move away from its equilibrium position is called amplitude. The distance between peak and valley and ridge or between valley is called wavelength. It is important to note that although the wave is spreading horizontally, the water never moves in this direction. Water moves up or down when it leaves its equilibrium position, but once the shock returns to its pOn the other hand, if the direction of motion of the particle and the direction of propagation are the same, as in (b), we have a longitudinal wave. Figure 4 can be performed without any change to any transverse wave, and a little imagination can also be used to represent a longitudinal wave. The sum of waves
presents some interesting phenomena. When two waves are
do not necessarily coincide with the crests of the ridges of the other. If they do, they say they are in phase. If two waves with equal amplitude are in phase, the result is a wave with an amplitude twice as large as the original. This is called constructive interference. If there is this coincidence is said that the waves are fuand nothing to disturb, as in the empty space, sound can not propagate. Huygens
says the light is made of waves
At the time of the Greeks, the two main theories were based on an analogy between sight and touch. Many centuries later, the analogy between vision and hearing prompted many reflections. The sight and sound have in common that they function over long distances. The wave nature of sound was already well established. It was inevitable question would not be too light a wave? A Dutchman named Christian Huygens Firmat answered this question.
The ripples in the water are the most typical example of a wave. When considering light as a wave, Christian Huygens could explain the stripes on the expYoung erimento as a result of constructive and destructive interference between light traveling through different paths. In the wave theory of Huygens, the light intensity is related to the amplitude of the wave while the different colors correspond to different values of wavelengths, the color red has the longest wavelength, while the color Violet has the shortest. According to Huygens' principle, when light encounters an obstacle, every point it becomes a new source of wavelets that spread in all directions, hence no diffraction problems. These wavelets interfere with each other, resulting in preferential directions of propagation, such as those occurring in the phenomena of reflectionng and refraction.
The bands that appear in Young's experiment can be explained
directly as a result of constructive and destructive interference between two beams of light.
the same way, light and dark regions in a diffraction pattern,
explained as a result of interference between rays diffracted in different directions. More importantly, the Huygens principle to calculate, with extreme precision, the expected diffraction patterns for different obstacles.
In summary, we have that the wave theory can explain properties of light as
the intensity and color and phenomena such as reflection, refraction, as does the particle theory
. But alsocan not propagate in vacuum as the light it can?
Huygens's principle can explain this without problems, since it predicts that the diffraction
only be noticeable when the obstacle dimensions are similar to the wavelength. The wavelength of light is very small compared to
everyday objects, so in our daily life is very difficult to perceive it and therefore we
consider that light travels in straight lines. In contrast, the wavelength of the sound is much bigger, so it can be perceived diffraction and these allow us to hear portions diffracted despite not being in front of the sound source, or that we go through any obstacle.
The fact that they arehen appears a burden? The difference between "there is strength" and "if a charge, there would be a force" is radical. The mere possibility that at some point, a "burden of proof" to suffer a force field called Michael Faraday.
Some believe that philosophy is synonymous with wasting time. However, when the head of Michael Faraday came the concept of field, nobody could imagine how that would revolutionize science and our way of life.
Although the concept of field seems a pipe dream only convenient, Michael Faraday
insisted the reality of their existence. To Faraday, the field was a disturbance of space.
A charge produces an electric field and also occurs if you move orNo magnetic field. The
"test loads" move because of the effect of the field in which they are submerged and not due to
action at a distance from the other charge. For many, it was difficult to share the hallucinations of Faraday. The field did not seem to be something tangible, but a simple idea and assume that the ideas are part of reality, seemed a matter of ancient philosophies overcome. The reality was made things matter ... not concepts. So philosophers who sought to put both feet in reality are sometimes called, as in the expression "dialectical materialism, well known by those who have had contact with socialist literature. Electromagnetic waves
Despite its intangibility, the reality of the fields reconsultation to be as certain as the sun illuminates the earth
. When James Clerk Maxwell's equations examined
describing the interactions between electric and magnetic fields realized that predicted that a disruption
they may spread. A variation of the electric field would produce a variable magnetic field. The variation in the magnetic field is reflected in a new variation of the electric field, which in turn would cause a variation in the magnetic field. The electric and magnetic field, two disturbances of space, they propagate together in what would be an electromagnetic disturbance. The speed at which this disturbance would propagate through empty space to be strangely consultation rvery similar to the speed of light, which had been measured at the time. The conclusion was amazing, the light was nothing more than an electromagnetic wave.
already mentioned that the wavelength of light is small relative to the size of everyday objects
. The question now was: Will there be electromagnetic waves with wavelengths of other sizes? Hertz was able to generate electromagnetic waves with wavelengths much longer. These radio waves are used today to transmit radio and television, as its wavelength is large enough, can get around obstacles: we can pick up a radio signal even though we can not see station transmitting antenna. For longer or
nda slightly longer than the red color found
infrared rays, ultraviolet rays while having wavelengths slightly shorter than violet. Both infrared electromagnetic waves such as ultraviolet
have properties very similar to that of light, sometimes referred to as light. Due to this broadening of the concept, the interval between red and violet, which is what our eyes can perceive, is called visible light.
ultraviolet rays, X rays and gamma rays are just electromagnetic waves with wavelengths shorter than visible light.
X-rays, which have had a spectacular application in medicine and gamma rays that produce the elements
radioactive revealed nothing more than
electromagnetic waves of shorter wavelengths than light. Interestingly, the smaller the wavelength of an electromagnetic wave, the more likely it is harmful to living beings. It is necessary to use sunscreen to protect our skin from ultraviolet rays, X rays can not be used in pregnant women and accidents such as Chernobyl cause terrible damage due to, among other things, the gamma-ray emission.
One consequence of considering light as an electromagnetic wave is that the ether
longer necessary. The ether had played an important role in support of the theory
wave, but that role was now the concept of ccrumbs. The fields are disturbances
vacuum, and once accepted this need not conceive of a special material that can disturb electromagnetic wave
. However, the ether, like all old ideas are resisted
die. However, the successful failure of Michelson-Morley experiment, which aimed to detect the ether, and the subsequent development of the theory of relativity by Albert Einstein, killed, buried and prayed novena to the ever useful concept. But that's another story to be told another time. Wave-particle duality
far, the debate about the nature of light could be counted as if it were a soap opera. The evil with his absurd Newton corpuscular theoryr an explanation that even Maxwell's electromagnetic theory could give. One of these phenomena was the photoelectric effect.
In the photoelectric effect, light energy can be transferred to an electron depends
color. Electromagnetic theory says that the energy contained in light is related to the amplitude of the wave while the color is related to its wavelength. Nowhere electromagnetic theory proposes a relationship between energy and color. Thus, the photoelectric effect remained a mystery.
The solution to the puzzle was clever, but the physics had to take a small leap
ago. Albert Einstein said that the photoelectric effect could be explained easily ifnsferida the electron depends on the color of the light and not its intensity.
All electromagnetic waves can be understood as consisting of photons.
For very long wave lengths, the photons have very little power, so the concept is not useful. In contrast, for X rays and gamma rays, photons are highly energetic and its study is indispensable for understanding the increasingly wide variety of electromagnetic phenomena that the theory can not explain.
Despite the usefulness of the new concept, the photon seems to have revived the old corpuscular theory of Newton
. The obvious question was: Is light a wave or a particle? The
evidence in favor of electromagnetic theory do not disappearn reality, all are ondaspartículas, where they can sometimes dominate the wave properties and others, those of
particle. This concept led to the development of quantum mechanics.
say that idleness is the mother of all philosophies. The truth is that thanks to the work undertaken by the Greek philosophers, we now have a technology that frees us from repetitive work and allows us to have free time during which we can continue philosophizing.
The story is not finished being written
are resigned not all that easily. Designed experiments constantly with
purpose of determining whether the light is particle or wave back. One of these consisted of a repetition of the experiment of Young, but networkwere as powerful tools for technological development. However, we should not fall into the oft-repeated mistake of taking the latest theories known as absolute truth. The truth must be something much more complex and certainly in the future balguien venture to find a new way to explain all these phenomena, a new form, so clear and elegant, it gets to dismiss the current theories. Will this happen soon?
Will we have chance to see it? Who will be brave dare? Could it be perhaps ...
one of us?
Wednesday, November 18, 2009
Who Plays The Voice Of Sailor Moon
N lenses. For example, in the electron microscope lenses are magnetic in nature. can be observed in astrophysical phenomena of gravitational lensing where light from very distant objects passing near massive objects, curving in its path.
The lens comes from the Latin word "lentis" which means "lentepene" with optical lenses that are named for the similarity of form with the legume.
In the fifteenth century began to manufacture small glass disks that could be mounted on a frame. Glasses were the first books
Artificial lenses
artificial lens is often referred to those built with artificial materials are not homogeneous, so that their behavior exhibits refractive indices less than unity (Remember that the phase velocity itself may be more that of light in vacuum), which, for example, bi-convex lenses are diverging. Again this type of lens is useful in microwave and only recently have been reported with this property materials at optical frequencies.
The lens comes from the Latin word "lentis" which means "lentepene" with optical lenses that are named for the similarity of form with the legume.
In the fifteenth century began to manufacture small glass disks that could be mounted on a frame. Glasses were the first books
Artificial lenses
artificial lens is often referred to those built with artificial materials are not homogeneous, so that their behavior exhibits refractive indices less than unity (Remember that the phase velocity itself may be more that of light in vacuum), which, for example, bi-convex lenses are diverging. Again this type of lens is useful in microwave and only recently have been reported with this property materials at optical frequencies.
Tuesday, November 17, 2009
Apple Cider Vinegar And Obsessive Disorder
Photon 
In modern physics, the photon is the elementary particle responsible for electromagnetic phenomena quantum manifestations. Is the carrier particle of all forms of electromagnetic radiation, including gamma rays, X rays, ultraviolet light, visible light, infrared light, microwaves and radio waves. The photon has zero invariant mass and travels in a vacuum with a constant velocity c. Like all quanta, the photon has both particle propertieso say what the excited molecule.
The previous description of a photon as a carrier of electromagnetic radiation is often used by physicists. However, in theoretical physics, a photon can be considered as a mediator for any type of electromagnetic interaction.
The discussion about the nature of light goes back to antiquity. In the seventeenth century, Newton preferred a corpuscular interpretation of light, while his contemporary Huygens and Hooke supported the hypothesis of light as a wave. D Experimentsand interference, such as that conducted by Young in the nineteenth century, confirmed the wave model of light.
The idea of light as particles returned to the modern concept of photon was developed gradually between 1905 and 1917 by Albert Einstein building on earlier work by Planck, in which he introduced the concept of terms. With the photon model could explain experimental observations that did not fit the classical wave model of light. In particular, explaining how the energy of light depends on the frequency (observed dependence on the photoelectric effect) and the ability of matter and radiationN electromagnetic to stay in thermal equilibrium.
Other physicists tried to explain anomalous observations by models "semiclassical", in which the light was still described by Maxwell's equations, but the material objects that emitted and absorbed n light were quantized. Although these semiclassical models contributed to the development of quantum mechanics, subsequent experiments have tested the hypothesis of Einstein on the quantization of light (light quanta are photons).
The photon concept has led to important advances in f & as properties Gauge symmetry.
Photons are applied to many areas such as photochemistry, the light microscope and measurement of molecular distances. Even they have been studied as components of quantum computers and sophisticated applications such as optical communication quantum cryptography.
The photon was originally called by Albert Einstein [3] "the light" (in German: das Lichtquant). The modern name "photon" comes from the Greek word φῶς (which is transcribed as phos), meaning light, and wascoined in 1926 by physicist Gilbert N. Lewis, who published a speculative theory in which photons could "create or destroy." Although Lewis's theory was never accepted, being contradicted by many experiments, the new name "photon" was quickly adopted by most scientists.
In physics, the photon is usually represented by the symbol (the Greek letter gamma). This symbol comes possibly gamma rays, discovered and baptized with that name in 1900 by Villard and that proved to be a form of electromagnetic radiation & eacute; policy as demonstrated by Rutherford and Andrade [10] in 1914. In chemistry and optical engineering, the photons are usually symbolized by, which also represents the energy associated with a photon, where is the Planck constant and the Greek letter is the frequency of particle. Much less frequently, the photon is also represented by, with, in this case, the frequency.
Light consists of electromagnetic energy particles called photons. Foton sporadically occurs when electrons (yellow) to approach accelerates ions (blue). At increased temperatures the productivity of a photon isumenta.
In modern physics, the photon is the elementary particle responsible for electromagnetic phenomena quantum manifestations. Is the carrier particle of all forms of electromagnetic radiation, including gamma rays, X rays, ultraviolet light, visible light, infrared light, microwaves and radio waves. The photon has zero invariant mass and travels in a vacuum with a constant velocity c. Like all quanta, the photon has both particle propertieso say what the excited molecule.
The previous description of a photon as a carrier of electromagnetic radiation is often used by physicists. However, in theoretical physics, a photon can be considered as a mediator for any type of electromagnetic interaction.
The discussion about the nature of light goes back to antiquity. In the seventeenth century, Newton preferred a corpuscular interpretation of light, while his contemporary Huygens and Hooke supported the hypothesis of light as a wave. D Experimentsand interference, such as that conducted by Young in the nineteenth century, confirmed the wave model of light. The idea of light as particles returned to the modern concept of photon was developed gradually between 1905 and 1917 by Albert Einstein building on earlier work by Planck, in which he introduced the concept of terms. With the photon model could explain experimental observations that did not fit the classical wave model of light. In particular, explaining how the energy of light depends on the frequency (observed dependence on the photoelectric effect) and the ability of matter and radiationN electromagnetic to stay in thermal equilibrium.
Other physicists tried to explain anomalous observations by models "semiclassical", in which the light was still described by Maxwell's equations, but the material objects that emitted and absorbed n light were quantized. Although these semiclassical models contributed to the development of quantum mechanics, subsequent experiments have tested the hypothesis of Einstein on the quantization of light (light quanta are photons).
The photon concept has led to important advances in f & as properties Gauge symmetry.
Photons are applied to many areas such as photochemistry, the light microscope and measurement of molecular distances. Even they have been studied as components of quantum computers and sophisticated applications such as optical communication quantum cryptography.
The photon was originally called by Albert Einstein [3] "the light" (in German: das Lichtquant). The modern name "photon" comes from the Greek word φῶς (which is transcribed as phos), meaning light, and wascoined in 1926 by physicist Gilbert N. Lewis, who published a speculative theory in which photons could "create or destroy." Although Lewis's theory was never accepted, being contradicted by many experiments, the new name "photon" was quickly adopted by most scientists.
In physics, the photon is usually represented by the symbol (the Greek letter gamma). This symbol comes possibly gamma rays, discovered and baptized with that name in 1900 by Villard and that proved to be a form of electromagnetic radiation & eacute; policy as demonstrated by Rutherford and Andrade [10] in 1914. In chemistry and optical engineering, the photons are usually symbolized by, which also represents the energy associated with a photon, where is the Planck constant and the Greek letter is the frequency of particle. Much less frequently, the photon is also represented by, with, in this case, the frequency.
Light consists of electromagnetic energy particles called photons. Foton sporadically occurs when electrons (yellow) to approach accelerates ions (blue). At increased temperatures the productivity of a photon isumenta.
Monday, November 16, 2009
Electricity Not Working In One Room OPTICAL
lar on the nature of light.
1
corpuscular theory This theory is due to Newton (1642-1726). Light consists of tiny particles of matter emitted at high speed in a straight line luminous bodies. The direction of propagation of these particles is called a ray of light.
Newton's theory is based on these points:
rectilinear propagation. Light travels in a straight line because the corpuscles that are moving at high speed.
Reflection. is known that the light at chOcara reflected against a mirror. Newton explained this phenomenon by saying that the light particles are perfectly elastic and therefore complies with the laws of reflection of elastic collision.
Refraction. The facts that change the speed of light in media of different density, changing the direction of propagation, it is difficult to explain the particle theory. But Newton assumed that the surface separating two media of different refractive index exerted a pull on the light particles, thereby increasing the normal component of velocity
The light energy is concentrated in each particle, as in particle theory, but is spread throughout the wavefront. The wavefront is perpendicular to the directions of propagation. The wave theory explains perfectly the luminous phenomena using a geometrical construction called Huygens' principle. well according to this theory, light travels faster in less dense media. Despite this, the theory of Huygens was forgotten for a century because of the high authority of Newton.
T. In 1801 English Young gave a great impetus to the theory
1
corpuscular theory This theory is due to Newton (1642-1726). Light consists of tiny particles of matter emitted at high speed in a straight line luminous bodies. The direction of propagation of these particles is called a ray of light.
Newton's theory is based on these points:
rectilinear propagation. Light travels in a straight line because the corpuscles that are moving at high speed.
Reflection. is known that the light at chOcara reflected against a mirror. Newton explained this phenomenon by saying that the light particles are perfectly elastic and therefore complies with the laws of reflection of elastic collision.
Refraction. The facts that change the speed of light in media of different density, changing the direction of propagation, it is difficult to explain the particle theory. But Newton assumed that the surface separating two media of different refractive index exerted a pull on the light particles, thereby increasing the normal component of velocity
The light energy is concentrated in each particle, as in particle theory, but is spread throughout the wavefront. The wavefront is perpendicular to the directions of propagation. The wave theory explains perfectly the luminous phenomena using a geometrical construction called Huygens' principle. well according to this theory, light travels faster in less dense media. Despite this, the theory of Huygens was forgotten for a century because of the high authority of Newton.
T. In 1801 English Young gave a great impetus to the theory
Sunday, November 15, 2009
Can Pinuecula Go Away On It's Own
Introduction 2 Historical development
major assumptions
3 4 Description of the theory under the Copenhagen interpretation
Mathematical formulation
5 6 Relativity and quantum mechanics
7 See also 8 References 9 External links
[edit] Introduction
Quantum mechanics is the last of the big branches of physics. Start at the beginning of the twentieth century, at the time that two of the theories attempting to explain what surrounds us, the law of universal gravitation and classical electromagnetic theory, became insufficient to explain certain phenomena. Electromagnetic theory generated a problem when trying to explain the emission ofconsequences for an undisclosed sum to obtain continuous left an infinite result, which eliminated the problem and, moreover, the result was consistent with what later was measured. It was Max Planck who then enunciated the hypothesis that electromagnetic radiation is absorbed and emitted by matter in the form of light quanta or photons of energy through a statistical constant which is called Planck's constant. His story is inherent in the twentieth century, as the first formulation of a quantum phenomenon was issued on December 14, 1900 at a meeting of the Physical Society of the Academy of Sciences in Berlin by the German scientist Max Planck. [3 ]
Planck's idea had been for many years as a hypothesis only if Albert Einstein had not taken up by proposing that light, in certain circumstances, behave as independent particles of energy (light quanta or photons). It was Albert Einstein who in 1905 completed the relevant laws of motion to what is known as the special theory of relativity, showing that electromagnetism was essentially non-mechanics theory. Thus ended what has been called classical physics, ie non-quantum physics. He used this view as he calls it "heuristic" to develop his theory of photoelectric effect. This hypothesis published in 1905 and earned him the Nobel Prize in 1921. This hypothesis was applied also to propose a theory of specific heat, ie it solvesand which is the amount of heat needed to raise the temperature by one unit mass of a body.
speeds of the constituent particles must not be too high, or close to the speed of light.
quantum mechanics breaks any paradigm of physics at that moment, she discovers that the atomic world does not behave as we would expect. The concepts of uncertainty, uncertainty or quantization are first introduced here. In addition quantum mechanics is the scientific theory that has provided the most accurate experimental predictions so far, despite being subject to the odds.
[edit] Historical development
Main article: Hiue reappeared this "mysterious" need to quantize the energy.
Compton Effect.
formal development of the theory was the work of the joint efforts of several physicists and mathematicians of the time as Schrödinger, Heisenberg, Einstein, Dirac, Bohr and Von Neumann and others (the list is long). Some of the key aspects of the theory are still being actively studied. Quantum mechanics has also been adopted as the underlying theory to many fields of physics and chemistry, including condensed matter physics, quantum chemistry and particle physics.
The region of origin of quantum mechanics can be located in central Europe, Germany and Austria, and the historical contextnergy behaves as a continuum.
Although the formal structure of the theory is well developed, and their results are consistent with experiment, not so with its interpretation, which remains controversial.
[edit] Description of the theory under the Copenhagen interpretation
to describe the general theory requires a rigorous mathematical treatment, but accepting one of the three interpretations of quantum mechanics (from now on the Copenhagen Interpretation) The framework is relaxed. Quantum mechanics describes the instantaneous state of a system (quantum state) with a wave function that encodes the probability distribution of all measurable properties, or observablemind as a particle that surrounds the nucleus, whereas in quantum mechanics is described by a static probability cloud surrounding the nucleus.
When performing a measurement on an observable system, the wave function becomes a set of functions called eigenstates or eigenfunctions of the observable in question. This process is known as collapse of the wave function. The relative probabilities of the collapse of one of the possible eigenstates is described by the instantaneous wave function just before the reduction. Considering the earlier example of the particle in the vacuum, measured in the same position, you will get an unpredictable value x. In general, it is impossible to predict with precisionn what value of x is obtained, although it is likely to get one near the center of the wave packet, where the amplitude of the wave function is large. After that has been done so far, the wave function collapses and the particle is reduced to one that is very concentrated around the observed position x.
Schrödinger equation is partly deterministic in the sense that, given a wave function to a given initial time, the equation provides a specific prediction of what will function at any later time. During a measurement, the eigen-state which is probabilistic function collapse and in this respect is not deterministic. So the probabilistic nature of quantum mechanics arises from the act of measurement. CHTM
ad of an observable in a given state by computing the spectral decomposition of the corresponding operator. The Heisenberg uncertainty principle is represented by the assertion that the operators corresponding to certain observables do not commute.
[edit] Relativity and quantum mechanics
The modern world of physics is based substantially on two main theories, general relativity and quantum mechanics, although both theories seem to contradict each other. The assumptions that define the theory of relativity of Einstein and quantum theory are indisputably supported by rigorous and repeated empirical evidence. However, both are reluctant to be incorporated into a single coherent model. The
Einstein himself is known for rejecting some of the demands of quantum mechanics. Despite being clearly resourceful in their field, Einstein did not accept the orthodox interpretation of quantum mechanics such as the assertion that a single subatomic particle can occupy several spaces at once. Einstein did not accept the consequences of even more exotic quantum entanglement of the Einstein-Podolsky-Rosen (or EPR), which shows that measuring the state of one particle could instantaneously change the state of his partner bound, although the two particles can be an arbitrary distance. However, this effect does not violate causality, since there is no possible transfer of information. In fact, there are theories cuinit.d that incorporate special relativity, for example, quantum electrodynamics, which is currently under proven physical theory, and these are in the same kidney of modern particle physics.
major assumptions
3 4 Description of the theory under the Copenhagen interpretation
Mathematical formulation
5 6 Relativity and quantum mechanics
7 See also 8 References 9 External links
[edit] Introduction
Quantum mechanics is the last of the big branches of physics. Start at the beginning of the twentieth century, at the time that two of the theories attempting to explain what surrounds us, the law of universal gravitation and classical electromagnetic theory, became insufficient to explain certain phenomena. Electromagnetic theory generated a problem when trying to explain the emission ofconsequences for an undisclosed sum to obtain continuous left an infinite result, which eliminated the problem and, moreover, the result was consistent with what later was measured. It was Max Planck who then enunciated the hypothesis that electromagnetic radiation is absorbed and emitted by matter in the form of light quanta or photons of energy through a statistical constant which is called Planck's constant. His story is inherent in the twentieth century, as the first formulation of a quantum phenomenon was issued on December 14, 1900 at a meeting of the Physical Society of the Academy of Sciences in Berlin by the German scientist Max Planck. [3 ]
Planck's idea had been for many years as a hypothesis only if Albert Einstein had not taken up by proposing that light, in certain circumstances, behave as independent particles of energy (light quanta or photons). It was Albert Einstein who in 1905 completed the relevant laws of motion to what is known as the special theory of relativity, showing that electromagnetism was essentially non-mechanics theory. Thus ended what has been called classical physics, ie non-quantum physics. He used this view as he calls it "heuristic" to develop his theory of photoelectric effect. This hypothesis published in 1905 and earned him the Nobel Prize in 1921. This hypothesis was applied also to propose a theory of specific heat, ie it solvesand which is the amount of heat needed to raise the temperature by one unit mass of a body.
speeds of the constituent particles must not be too high, or close to the speed of light.
quantum mechanics breaks any paradigm of physics at that moment, she discovers that the atomic world does not behave as we would expect. The concepts of uncertainty, uncertainty or quantization are first introduced here. In addition quantum mechanics is the scientific theory that has provided the most accurate experimental predictions so far, despite being subject to the odds.
[edit] Historical development
Main article: Hiue reappeared this "mysterious" need to quantize the energy.
Compton Effect.
formal development of the theory was the work of the joint efforts of several physicists and mathematicians of the time as Schrödinger, Heisenberg, Einstein, Dirac, Bohr and Von Neumann and others (the list is long). Some of the key aspects of the theory are still being actively studied. Quantum mechanics has also been adopted as the underlying theory to many fields of physics and chemistry, including condensed matter physics, quantum chemistry and particle physics.
The region of origin of quantum mechanics can be located in central Europe, Germany and Austria, and the historical contextnergy behaves as a continuum.
Although the formal structure of the theory is well developed, and their results are consistent with experiment, not so with its interpretation, which remains controversial.
[edit] Description of the theory under the Copenhagen interpretation
to describe the general theory requires a rigorous mathematical treatment, but accepting one of the three interpretations of quantum mechanics (from now on the Copenhagen Interpretation) The framework is relaxed. Quantum mechanics describes the instantaneous state of a system (quantum state) with a wave function that encodes the probability distribution of all measurable properties, or observablemind as a particle that surrounds the nucleus, whereas in quantum mechanics is described by a static probability cloud surrounding the nucleus.
When performing a measurement on an observable system, the wave function becomes a set of functions called eigenstates or eigenfunctions of the observable in question. This process is known as collapse of the wave function. The relative probabilities of the collapse of one of the possible eigenstates is described by the instantaneous wave function just before the reduction. Considering the earlier example of the particle in the vacuum, measured in the same position, you will get an unpredictable value x. In general, it is impossible to predict with precisionn what value of x is obtained, although it is likely to get one near the center of the wave packet, where the amplitude of the wave function is large. After that has been done so far, the wave function collapses and the particle is reduced to one that is very concentrated around the observed position x.
Schrödinger equation is partly deterministic in the sense that, given a wave function to a given initial time, the equation provides a specific prediction of what will function at any later time. During a measurement, the eigen-state which is probabilistic function collapse and in this respect is not deterministic. So the probabilistic nature of quantum mechanics arises from the act of measurement. CHTM
ad of an observable in a given state by computing the spectral decomposition of the corresponding operator. The Heisenberg uncertainty principle is represented by the assertion that the operators corresponding to certain observables do not commute.
[edit] Relativity and quantum mechanics
The modern world of physics is based substantially on two main theories, general relativity and quantum mechanics, although both theories seem to contradict each other. The assumptions that define the theory of relativity of Einstein and quantum theory are indisputably supported by rigorous and repeated empirical evidence. However, both are reluctant to be incorporated into a single coherent model. The
Einstein himself is known for rejecting some of the demands of quantum mechanics. Despite being clearly resourceful in their field, Einstein did not accept the orthodox interpretation of quantum mechanics such as the assertion that a single subatomic particle can occupy several spaces at once. Einstein did not accept the consequences of even more exotic quantum entanglement of the Einstein-Podolsky-Rosen (or EPR), which shows that measuring the state of one particle could instantaneously change the state of his partner bound, although the two particles can be an arbitrary distance. However, this effect does not violate causality, since there is no possible transfer of information. In fact, there are theories cuinit.d that incorporate special relativity, for example, quantum electrodynamics, which is currently under proven physical theory, and these are in the same kidney of modern particle physics.
What Is The Best Compound Bow LIGHT AS WAVE
Light as a wave
In the nineteenth century Fresnel and Young observed the phenomena of interference and diffraction of light, which could not be explained with the hypothesis of Newton, and Foucault measured the speed of light in different media and observed that passing from air to water decreased its speed, as proposed by Huygens.
These findings allowed them to consolidate the ideas of Huygens on the wave nature of light, although there were still some unresolved issues related to the nature of light and its propagation in a vacuum.
propagation of light:
One of the most complex to explain the wave nature of light has been asked
In the nineteenth century Fresnel and Young observed the phenomena of interference and diffraction of light, which could not be explained with the hypothesis of Newton, and Foucault measured the speed of light in different media and observed that passing from air to water decreased its speed, as proposed by Huygens.
These findings allowed them to consolidate the ideas of Huygens on the wave nature of light, although there were still some unresolved issues related to the nature of light and its propagation in a vacuum.
propagation of light:
One of the most complex to explain the wave nature of light has been asked
Jcpenney Antique Chair experimentaluz @ 2009-11-15T17: 04:00
Light (from the Latin lux, lucis) is the kind of radiant electromagnetic energy that can be perceived by the human eye. In a broader sense, the term light includes the entire range of radiation called the electromagnetic spectrum.
science that studies the main ways of producing electricity, as well as control and applications, is called optical.
The lens is the part of physics that studies light and related phenomena, and their study begins when the man tries to explain the phenomenon of vision.
Different theories have been developed to interpret the nature of light to reach the current knowledge. The first contributionspaid straight to reach the object.
It would be nothing more than thirteen centuries before the Arab Ajas Basra (965-1039) believed that light was a bullet that came from the sun, bouncing off objects and of these the eye.
What is light?. The wise men of all ages have tried to answer this question. The Greeks assumed that the light emanating from objects, and was something of a "spectrum" of them, extremely subtle, to reach the observer's eye allowed him to see.
Thus the Greeks and the Egyptians were brought to the solution of these problems without adequate answers. Later in S. Europe XV to XVII, with the advances made by science and technology, its
science that studies the main ways of producing electricity, as well as control and applications, is called optical.
The lens is the part of physics that studies light and related phenomena, and their study begins when the man tries to explain the phenomenon of vision.
Different theories have been developed to interpret the nature of light to reach the current knowledge. The first contributionspaid straight to reach the object.
It would be nothing more than thirteen centuries before the Arab Ajas Basra (965-1039) believed that light was a bullet that came from the sun, bouncing off objects and of these the eye.
What is light?. The wise men of all ages have tried to answer this question. The Greeks assumed that the light emanating from objects, and was something of a "spectrum" of them, extremely subtle, to reach the observer's eye allowed him to see.
Thus the Greeks and the Egyptians were brought to the solution of these problems without adequate answers. Later in S. Europe XV to XVII, with the advances made by science and technology, its
Pokémon Dōjinshi
Hello!
Glad to see you here:)) Well you are interested in learning something new (or already old) the theme of light? Then you have found the right place because this is made to open the doors to the World of Light!
Are you in?!
Glad to see you here:)) Well you are interested in learning something new (or already old) the theme of light? Then you have found the right place because this is made to open the doors to the World of Light!
Are you in?!
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