How could we prouve that white light contains a mixture with different wavelengths? (colors)?
448202
If you shine a white light through a prism, the light is refracted and you get a rainbow. Thats how you can see the different wavelengths in white light.
560835
with travelling electrons.depending on their wavelength,colours are formed
10447
The "white" is caused by the crystalization of water molecules when they are frozen.  Light refracts off these crystals in a full spectrum (so you get white.)  When the molecules free again after getting warm, the light no longer refracts off in the full spectrum removing the white color.\n\nBTW white light is made of millions of colors...
956853
sorry, I agree that D is correct. (\nhttp://www.abledata.com/abledata_docs/Night_Vision.htm )\n\nAs perception of white (or any gray levels) is the equal stimulation of all three different photopigments/photoreceptors, you can see all grey levels using your cones only. No mystery about it. If you understand additive color mixing you can use Photoshop to prove this on your computer. Or you can use colored transparencies and a projector. Research additive color mixing if you are not familar with it. So you can have no rods (look up night blindness) and still see black (no stimulation) and white (equal stimulation of all three cones) during the day time using your cones only. So the answer is no, you can not be "black, grey, white blind" , but it doesn't have to do anything with the presence or absence of rods in your eyes. \n\nThough there seems to be a really minor effect of rods on the perceived hue, colors could be somewhat less saturated,and it seems to rely on interaction of nerve cells other than the primary photoreceptor cell. Generally Pubmed or Google Scholar should both allow you to search large databases of science publications which haven't made it into textbooks.
283630
no i don't have any info. but i think we're able to detect all of the colors of the spectrum.
854178
Uh, I'm not smart on this, so I'm guessing here, but...\nSince different frequencies and wavelengths are what determines what color is being reflected, there has to be some way to quantify the amount of each in different hues of different colors.  Does that even make sense?  I don't know...
522376
I believe it DEPENDS on the Frequency of that photon.\nWHITE lite comes into a prism (water droplets) and the\nindividual photos are BENT (refracted) various amounts\ndue to their frequency... thus we get to see the spectrum\n... rainbow... \nSo, yes, a photon going from one medium into another\nwould alter it's path a little at the juncture, \naccording to its frequency...  no "references", \njust my  off-the-cuff reply.  good luck.
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."
590116
When light falls onto an object a part of the spectrum is reflected and another part is absorbed. Depending on the (micro)texture of the object, different parts of the spectrum are reflected and we sense another color. Since there is a differennce in microtexture between wet and dry clothes, we experience a slightly different color.
92674
The color of an object affects how much light an object absorbs or reflects.  The spectrum of visible light are seperated in to additive colors and subtractive colors.  Additive colors reflect light and the primary additive colors are Red, Blue, and Green.  The Primary Subtractive Colors also known as the (Primary Pigments) absorb light and they are Yellow, Cyan, and Magenta.  When you mix all primary additive colors you will get white and when you mix all subtractive colors you get black, which means black absorbs the most light, which means it aborbs the most energy.
1027447
Ordinary white light, like that from the sun, is made up of many different colors all of which have a different wavelength.  Normally, when we see light from the sun, it appears colorless.  However, Isaac Newton discovered in 1666 that when he passed regular sunlight through a prism (basically, a triangular piece of glass), the prism would split the light up into a band of colors. \n\nThe band of colors is called the spectrum which appears in the order of red, orange, yellow, green, blue, indigo, and violet. \n\nWhen it rains, the air is filled with raindrops.  These raindrops act like a prism.  If sunlight passes through the raindrops at the proper angle it is split into its spectrum, which is made up of the colors of the rainbow. \n\nYou can make your own rainbow at home by filling a plastic box with water and placing it near a sunny window.  If the wall next to the window isn’t white, place a piece of white paper next to the window.  Next, place a mirror inside the box of water facing the window.  The mirror needs to be tilted towards the sunlight.  The wedge of water in the front of the mirror acts as the prism and the mirror reflects and image of a rainbow on your wall
916533
concentration of the chromophore and wavelength of light that it absorbs. the different wavelengths give the solution (chromophore) different colours.
568363
Of course, sunlight is made up of many colors.  However, we can think about "original" (or "monochromatic", or more realistically nearly monochromatic) yellow lights from other sources (like a laser).\n\nWith the composed yellow, you can separate the green and the red back out.  One way to do this would be with a prism.  While the monochromatic yellow light would just stay yellow, the composed red+green would separate back out, with each color in its position in the rainbow.\n\nA more sophisticated way to do this would be with a spectrometer.  The monochromatic yellow would show just the one wavelength, in the yellow part of the spectrum.  The composed light would show two wavelengths: one each in the green and red parts of the spectrum.  It would show no light in the yellow part of the spectrum.\n\nSnawshia is right about the speed: in a vacuum, they'll have the same speed.  In other media (water, glass, etc.), each color may have a slightly different speed.
698431
The simplest, but least effective, way to do this is to convert the image to grayscale.\n\nFor a more flexible option, you can add a hue/saturation adjustment layer. See this page for a walk through:\n\nhttp://tricks.onigo.net/guides/2005/08/convert-to-black-and-white-using.html
1146629
Visible light is within the electromagnetic spectrum.  This spectrum consists of different frequencies such as microwaves, visible light, gamma rays, laser, etc.  Visible light is just a band width within the electromagnetic spectrum that humans can detect with thier senses.  ROYGBIV- red, orange, yellow, green, blue, indigo, and violet.  These are the colors that are detectable by humans within the electromagnetic spectrum and make up the visible light that we see.
542166
White light is not split up by different particles in the air (the exception are water droplets in a rainbow, the blue sky and the orange and red of sunsets and sunrises). Objects outside the atmosphere reflect back their colors, without white light being broken up by air. The moon is yellow, Mars is red and look at all the colors of Jupiter. \n\n\nWhite light is made up (already contains) the different colors of the visible light spectrum: Red Orange Yellow Green Blue Indigo Violet. (Roy Green bit Iris Vaughn is a mmemonic to remember the colors) \n\nWhat distinguished the different colors in the spectrum is their wavelength. When white light hits an object like grass or wood only the color you see the object as, is reflected, the other colors are absorbed.
38249
Actually there is no chemistry. Its all about physics - scattering of light.\n\nLight as you know is made up of lots of colors (seven colors visible in the rainbow actually consists of millions of colors). The color depends on the wavelenth of light. Light from the sun is white meaning it has all colors (wavelengths) equally.  \nThere is a principle in physics called Raleigh scattering. Short wavelenths(blue/violet) are absorbed and scattered by the atmosphere and with longer wavelenghts (red) are not absorbed/scattered. As blue light is scattered by the atmosphere it looks blue. \n\nAt twilight, the sky looks red/pink. This is because, the sun's light dosn't get chance of scattering. As red light is least absorbed, that is the light that comes directly to us.