How could we prouve that white light contains a mixture with different wavelengths? (colors)?
360723
Use a prism like Newton did.
515908
A mix; you can't have light without the dark.
461513
I dont think you can. =^P It would be wierd if I was seeing blue and somebody else was seeing (my version of) red and saying it was blue... Mabye everybody has different color views. Never know.
67475
Our eyes react to different shades of light, and what we determine as colors\nare different wavelengths of light.  When we say an object is a certain\ncolor, it is because it is reflecting more of a certain wavelength light.\nFor example red objects reflect "red" light, or light with a longer\nwavelength (lower frequency) better than other types of light.\n\nSo, we determine the color by the primary type of light the object reflects\n(or emits if it is a light).\n\nWe also perceive other properties of colors, and that is lightness or\ndarkness.  A light colored object may reflect one color especially well, but\nalso reflect other colors as well.  A very light green object, for example,\nreflects green very well, but also reflects most other colors, just not as\nwell.\n\nDark objects tend not to reflect light very well at all, even if it reflects\none color better than the other.\n\nWhite objects, tend to reflect all types of light equally well, and tend to\nreflect most of the light cast on it.\n\n\n\nBlack absorbs-white reflects, that is why.
869894
There are two aspects to color:  pigment and wavelength.  Pigment is an aspect of the object we're talking about when we say "what color is it?"  Wavelength is an aspect of light, which is made up of different wavelengths.  White light contains all the possible wavelengths.  \n\nWhen light hits pigment, some of these wavelengths are absorbed and some are reflected.  A black pigment absorbs all the wavelengths; no color is reflected, so there is the absence of color--black.  When something looks red, it is because wavelengths in the red spectrum  of light are being reflected.  \n\nThings look different in different lights because not all light is white light.  Something will look different under a light bulb than under sunlight.\n\nLisaJay\n\nhttp://www.eclecticdetective.blogspot.com
398344
Color is a function of the wavelength of light reaching an object and the reflective properties of the object. If the illumination is a different color, the object will have a different color.  Let's assume white light to be the standard, then a color will be the same if you are near an object whether there is air or not.  If you are at the surface of the earth and the object is in the sky, atmospheric effects will change the color possibly (like our blue sky).
460409
Just guess what the colors would be for different compounds before you actually do the flame test for the hypothesis.  \nOr you could guess whether it is the cation (the positively charged metal ion) or the nonmetal anion that is responsible for the different colors.
1107219
Okay, two different things.  When mixing colors of the spectrum, white light results from mixing all the colors together (that's why many older video projectors have a red, green and blue light that combine to make all the colors)  Black is the absence of all light.\n\nWhen mixing pigments and paints, the opposite is true -- white is absence of any pigment, and black is the result of every color mixed in.  The reason you mixed gray or brown color instead of black is because paints are not perfectly pigmented; paints are composed of tiny particles suspended in some sort of solvent, and depending on the colors, you might have white or black particles in there that were added to adjust the hue of the particular colors you've bought.  (Adding white paint to black paint just means that you have a mixture of white and black particles, and thus your brain puts it together as gray)  So the gray color you ended up with still didn't have all the colors possible, and could never reflect back to your eye a uniform spectrum of all colors.  A sort of murky brown is the closest you'll likely get to black by mixing a bunch of paints together.
317548
You are confusing emissive mixing with subtractive mixing. When dealing with pigments, one customarily uses the colors Cyan, Magenta, and Yellow as primary colors. This is because you are actually dealing with a subtractive spectrum. The colors of the pigments are the part of the spectrum that is not absorbed by the material, so mixing them is not an additive procedure, but a subtractive procedure. Mixing all of the three colors above will not get you white, but (in a perfect world) will subtract every color from being reflected, giving you black, the absence of photons. In the real world, the pigments are imperfect and you actually get a murky dark greenish color, which is why an independent black ink is added to printing processes (CMYK).\nRed, Green and Blue are primary for the emissive spectrum, these are used for mixing colors of pure light (ie., CRTs and LCDs). Mixing all of these colors (use red, green, and blue filters in front of white lights) will get you white, as it should. See the article below for more detail.
730478
White light is a combination of many wavelengths of the visible light spectrum.  As these wavelengths pass through water droplets suspended in the air, they are refracted at different angles.  Because of the angle of refraction, and because each wavelength of light is bent at a different, specific angle, the result is the division or sorting of light into wavelengths, which the human eye then perceives as color.\n\n:) Hope this helps!
416072
It depends on the wavelength of the light and its energy.
237515
Two supplementary colours give together the impression of white. Use a magnifying glass on your coloured t.v. screen and look at white places.
1185766
droplets of water in the air refract light and break it into the visible specturm. thats way you see the different colors.
516847
heres a good website i found with some answers\nhope its helpful\nhttp://desktoppub.about.com/cs/colorselection/p/white.htm
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...
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
421471
In pigments (like paint) yellow and blue make green.\n\nIn lights, if you mix red and green lights, you get yellow light. If you add in blue light, you get white light, so for lights, yellow and blue make white.