X-rays travel at the same speed as visible light. All frequencies of electro-magnetic radiation (of which light is a very narrow band) travel at the speed of light (C) in a vacuum: 299,792,458 meters per second.
The speed of light varies in different medium. Given an angle of incidence other than 90 or 0, the wave will shift direction an amount determined by its frequency. The higher the frequency, the greater the shift. The transition between two medium of different refractive indices causes a variation in the phase velocity of the wave, but does not affect its frequency.
Yes, a "black light" is an ultraviolet light with wavelength of about 395-410 nm.
In white light various colors of light are mixed together, primarily blue yellow and red. When white light in air passes through a glass prism having a certain refractive index, all the differently colored lights have the same angle of incidence (θ) but each differently colored light has a different emergent angle of refraction, going from red light (at the minimum angle) to blue light (having the maximum angle).
According to the refractive index formula n = sin θ ／ sin γ, where n is the refractive index of the prism, sin θ is the sine of the angle of incidence (θ) and sin γ is the sine of the angle of refraction (γ).
I believe that is just a different way of describing the effect, not an explanation. Red light in glass travels at a lower speed than in air or vacuum. So when a wavefront hits a flat surface of glass at an angle, the end of the wave front inside the glass travels more slowly than the part of the wavefront that has not yet entered the glass. But the wave front must still be continuous all along its length, and the only way to achieve that is if the wavefront inside the glass proceeds in a tilted direction. The slower the light in the glass, the bigger the change in angle. Green light in glass travels faster than red and slower than blue. So the different colors are spread into different angles of refraction.
Bioluminous things include glow worms, the sun, stars, the moon, fire.
Non luminous things include books, tables, contrasticly painted street signs, light wear, bright orange rooms, bright yellow rooms.
Luminous things include Light bulbs, lamps, cell phone screens, computer screens, tv screens, las vegas, light - up sreet billboards, street lamps, stoplights, car headlights, car taillights, flashlights, bicycle lights, candles, iPads, iPod nanos.
The rainbow consists of the visible spectrum ranging from red, orange, yellow, green, blue, indigo, and violet.
The rainbow has ALL of the colors. Every shade of paint that was ever
mixed, every hue of fabric ever dyed, every highlight of hair, every color
that any human eye ever saw or is able to see, they're all in the rainbow.
Many have names, but most don't.
Isaac Newton discovered the visible spectrum of light while fooling around with a prism (from which is derived the basic principle of a rainbow.) He later wrote about his findings in his well-known book, Optiks. Isaac Newton was also a master of atsronomy, calculus, and physics. It was also he who "discovered" gravity when an apple fell on his head. It is also probable that this experience led him to discover the effect of concussions on dementia. OK, not really about the dementia part.
All the sun's rays penetrate water, but each color penetrates to a different depth. The colors at the upper end of the light spectrum, especially the UV (ultraviolet) that causes tanning, penetrate deepest. The UV portion of the sun's light can penetrate into clear water for a hundred feet or more at midday. The safest way to avoid overexposure is to remember that if you can see the sunlight, it may cause sunburn, and to limit exposure accordingly or perhaps wear a T-shirt or wet-suit.
There are 7 main colours but are normally the 7 colours that are always used.
7.Violet (not called purple because that's the way it is in this case)
To remember all there colours easily with the Acronym (ROY G. BIV)
If you are referring to the wave-particle duality of light, it is a theory Albert Einstein came up with. The way light acted really confused scientists. Light sometimes acts like a wave, and sometimes acts like a bunch of particles. Albert Einstein ran a multitude of tests. After all of his tests he came to the conclusion that light is unique in that sometimes it can act like a wave, and sometimes it can act like particles.
No, infrared radiation (IR) does not have a higher frequency than visible light. Visible light is above IR on the electromagnetic spectrum. It (visible light) has higher frequency and shorter wavelengths than IR radiation does.
Light is emitted when an electron drops from the orbit of an excited state, into its natural state.
The quantum of light emitted is characteristic of the change in energy of the two electron states, and also of the actual element involved.
Tritium lighting is made using glass tubes with a phosphor layer in them and tritium (a hydrogen isotope) gas inside the tube. Such a tube is known as a "gaseous tritium light source" (GTLS). Because tritium in particular is an integral part of thermonuclear devices (though in quantities several thousand times larger than that in a keychain), devices containing tritium are considered dual-use technology in the U.S.A., and are therefore illegal for export. However, they are widely available in the U.K., most of Europe (some countries like Belgium have outlawed them however), Asia and Australia. Tritium devices can be purchased in the UK and Australia, but are illegal for import to the United States, however they are available in the US as gunsights and for military applications. UK Source
http://www.crazyaboutgadgets.com/detail.asp?ID=371 AU Source
http://www.kitbag.com.au/prod849.htm USA Source (Military Personnel only)
http://www.ameriglo.net/tactical_dev.htm You can also find tritium lighting in the US without having to be military personnel at http://www.unitednuclear.com. They have a limited stock, though.
We call it the "speed of light", but it's also the speed of radio, X-rays, heat,
ultraviolet, microwave, gamma rays, etc, and all forms of electromagnetic radiation travel at the same speed, as long as they're in the same medium (vacuum or material substance).
There are a great many sources of visible light.
-- incandescent lamp filaments
-- electric sparks/arcs
-- excited/ionized gas
-- stove burners
The paint absorbs blue light, which means red and green light are preferentially reflected and red and green combined appear yellow.
This may be the reverse of what you learned in art class; the reason is that mixing pigmentsinvolves subtractiveprimary colors and mixing light involves additivecolors. Shine a red and a green light on the same spot and it will appear yellow.
Free Electron Theory:
This theory tells that, metals conduct electricity because of the presence of free electrons in it. The outermost shells of metal atoms will be loosely bound with their nucleus. So the electrons in it are free to move anywhere in the solid.These electrons are called free electrons and they are responsible for the conduction of electricity.
Band theory of solids:
A solid is assumed to contain many bands in which the electrons in it are packed. The most important are valence band and conduction band. The energy of electrons in these bands will be different.The difference in energies of valence band and conduction band determines whether the solid is a conductor, semi - conductor or insulator.For insulators, the difference between energies of them ( energy gap ) will be very high, and for conductor, these bands overlap each other.
The conduction band carries the electrons that conduct electricity, but the valence band has all the electrons in the ground state. Whether they go into the conduction band depends on the temperature and the energy gap between the bands. In a conductor, these bands overlap, and hence many electrons can become conducting. Thus, Band Theory explains distinction between metals and insulators, which Free Electron theory cannot do (since it assumes all valence electrons become conducting). Calculations are be performed to see which materials will have big energy gaps and which will have overlapping bands.
Tail lights in automobiles are in use for the simple reason that cars behind you can see you at a glance. A car without tail lights can easily be camouflaged, in the right environment. Tail lights ensure that this does not happen, especially when a car is braking. and so me nor any of my brothers in arms dont pull you over that is always a easy way to meet quota
The Lens is the image-forming device on a camera. The lens bends light rays to project an image onto a light sensitive medium, which may be any of several forms, including film, sensitized glass plate, or electronic sensor.
The Diaphragm is a variable opening which controls the quantity (brightness) of light falling on the light sensitive medium.
The Shutter controls the length of time light is permitted to fall on the light sensitive medium. It can take many forms, but usually has some method for precision adjustment of the time it is open.
Light passing through the lens, aperture, and (when open) the shutter forms an image of specific brightness for a specific duration on the light sensitive medium.
Light also passes through a viewfinder system, which may be a part of the optical system of the camera, or separate from it. In the most complex cameras, some of the light passing through the lens is diverted into a viewfinder by means of a mirror or prism. By using some of the same light passing into the camera, these systems permit the user to see essentially what the camera is seeing.
Of the colors in the visible spectrum, red has the lowest frequency and the longest wavelength. As you move on "up" the spectrum, wavelengths get shorter.
Red has the longest spectrum of all visible light. But infrared is even longer and there are many more "colors" but you can't see them.
Yes. It is marketed under the generic product description "flat black".
Note: You may from time to time encounter an advertisement promoting "fat back",
particularly in close proximity to ethnic restaurants. Do not be misled, for that is an
entirely different product.
X-ray energies in the range 120 eV to 120 keV. UV energies from 3eV to 124 eV.
A true "black light" should emit only ultraviolet radiation.
Violet light waves have the highest frequency visible to a human eye. Ultraviolet has a higher frequency, and the human eye cannot detect it.
When you buy a "black light" at the party store, in addition to the ultraviolet radiation, the bulb will usually give off violet light as well (analogous to a yellow light bulb looking a bit orange).
You can see the violet light, but it's really the invisible, high energy ultraviolet light that provides all the "cool" effects.
They aid in helping you to see things.
It contains amino acids with aromatic groups
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