wats the difference between visible and braoda band region, give the wavelengths of the same?
550292
If you mean by "broad band" the entire electromagnetic spectrum, visible light is a small bit (of the entire spectrum)that our eyes are able to detect.  As far as particular wavelengths/freqs and other cool info go see:\nhttp://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html
1184267
because white light is made up of many particles/waves of different wavelengths.  The bands aren't formed as in made, they're formed as in resolved or separated.  And they're seperated because when they bounce off of the interior angles of the prism they bounce at different angles, determined by their wavelength.
768561
Air scatters different wavelengths of light different amounts.  We normally see the sky as blue because the sky scatters higher wavelengths of light more then lower wavelengths of light.  Blue is a short wavelength while red is a long wavelength.  Anyway, when the sun is rising or setting on the horizon you are looking through much more air to see the sun then say, at noon when the sun is straight over head.  There is so much air that you see the red, instead of the blue, because the blue has long since scattered off while the red is still able to travel through the atmosphere to your eyes.
382985
Light and radio signals are all the same thing, electromagnetic radiation. Radio waves are just very low frequency light and light is just very high frequency radio signals. All objects that are hotter than absolute zero give off some electromagnetic radiation. The really hot objects give off visible light. Cooler ones give off infra red light. Cooler still and you get radio emissions. The Earth's surface gives off radio waves because it is warm. In fact, it gives off so much that it is an interference for communication satellites trying to hear signals from the ground.\n\nModern radio astronomy uses giant antennas to focus radio waves, just like optical telescopes focus visible light. Computers are used to construct images of what the sky would look like if your eyes could see radio waves.
913461
"Near Infra-Red" starts at 750nm wavelength (a fixed, accepted value).\nIn theory, and by definition, we CAN'T see it.\nHowever, we are all different: we are not machines built on a standard.\nTo find out if you can see NIR, you have to go to a laboratory, ask for a calibrated source of light and check from say, 650nm to 900nm wavelength radiations.  You will then be able to find exactly your limit for "your" visible.  If it is above 750nm, then you see NIR... officially!\nYou can compare this to your auditive perception: the AF (audio frequencies range, by definition, from 16Hz to 16000 Hz).\nMany of us cannot hear 16kHz, many of us can hear much higher than that!\nIt is all relative.
532872
Radio Waves\nInfrared light\nVisible Light\nGamma Rays
997357
light and heat are both electromagnetic waves. Light is in the visible spectrum, and heat is in the infrared spectrum, which is right next to the visible spectrum, but below it. \n\nThink of a coil spring. Look at it from the side. The cols are like waves. Light waves are spaced a certain distance apart. When the spring is stretched, the waves have lower energy and take up more space-- they are longer. These are heat waves and radio waves, compared to visible light.\n\nNow, suppose that the spring is squeezed together rather than stretched apart. This time, the waves are closer together, and have a higher energy. These are ultraviolet waves, or (depending on how high their energy goes) x rays, or even gamma rays.\n\nSo, all the waves are related, it is just how much energy they have that makes them spread out or crowd together. Visible light just happpens to be in the middle, the colors we can see.
524846
B'coz wavelength decides the power gain that transmitting antenna should have .\n& distance that can be covered by signal also depends on wavelength.
29546
Actually a rainbow contains the entire visible light spectrum. Our words and terms for individual colors is (somewhat) arbitrary.\n\nThere is nothing inherent in physics of color or our eyes why, for instance, light with a wavelength around 470 nanometers should be a distinct color (in this case blue). It seems like a strange idea, because our use of language cements the notion that these colors are somehow special when compared to light at intermediate wavelengths.\n\nTests have been done with children of different cultures to see if there is some hardwired circuitry in the human brain to identify distinct colors the same way. In other words, we see red, blue, green, but does another culture see (what we call) purple, blue-green, and yellow-orange as their primary colors?\n\nAs an aside it is interesting to note that ancient Greek and Roman texts, for instance, tend to have a lot fewer color terms than modern works of literature. \n\nAn early test in the 19th century where anthropologists did the ask-kids-color test suggested that in other cultures people tend to pick out colors from the base set of 11 in English (red, yellow, green, blue, brown, purple, pink, orange, black, white, and grey) - suggesting that there is something to the idea that these colors are hardwired into the brain.\n\nOn the other hand, at least one more recent study found the opposite - that when shown a selection of hues children from another culture did not pick out the 11 English terms as special or primary.\n\n(Later of course the system gets refined, as physics lets us know how to combine colors in different situations. That is, once you pick "blue" as one of your special colors, then physics demands that the other primary colors are red and yellow. But it is not unique. If you start with purple then blue-green and yellow-orange are the other primary colors.)\n\nBut, regardless of whether or not some colors are hardwired into the brain, a rainbow shows a continuous spectrum across the visible light range and beyond - extending slightly into the infrared and ultraviolet regions.\n\nSo, the reason why a rainbow has the 7 primary colors is that these are the ones which we have identified and named as being "special."
389650
microwaves have the longest wavelength of your three choices. Gamma rays have the shortest and ultraviolet waves are at the far end of the visible light spectrum and have a wavelength shorter than microwaves but longer than gamma rays.
791078
I suppose the answer is ultaviolet but as it is outside the visual spectrum of elctromagnetic radiation I can't see how you could define it as a coloUr.
1078761
Infrared is light that has a wavelength outside the bottom of the visible spectrum--it is essentially the "colour" that occurs before red (the lowest visible wavelength).\n\nThe invisible "light" that occurs at the top of the visible spectrum is ultraviolet.\n\nBoth of them can't be seen with the naked eye, but can alter the way the eyes perceive the other--visible--colours.
660323
They are so small, they're smaller than a wavelength of visible light.\nThe color of light is dependent on the wavelength. Because they are smaller than a wavelength, they have no color.
755040
Light spectra is essentially due to the electronic levels, not the nucleus (the nucleus emission/absorption would be at much higher frequency, in the gamma range); and there are no notable difference between the electronic energy level due to the extra neutron deuterium has in its nucleus; therefore very little difference in the visible band between protium and deuterium.
143804
Only light within the visible spectrum (450 nanometres (nm) wavelength, to about 700nm wavelength). \n\nOther light (infra red and above / ultraviolet and below) is not visible.
837206
They are all the same thing..... Electromagnetic waves. Scientist called the waves with  longer wavelengths radio waves and the waves with the shorter wavelengths gamma rays. Visible light is somewhere in between.
681686
Na emits light at a primary wavelength of 589.0 nm (plus at a couple other wavelengths).  This light is a characteristic orangey-yellow, and is what makes street-lamps the colour they are, since many of them are sodium lamps.