Is it supposed to be a frequency of light or a combination of all colors or both? What does it mean when a prism splits up a color?
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Color is the interpretation by our brain of the light our eyes detect. It is not an inherent property of light.
If you look yellow on a computer screen you are, in reality, you eyes get red and green lights but because how your eyes work is interpreted it the result if just yellow light detects it.
There are spectral colors that are a color we can experience our eye is hit buy a single wavelength of light, The color of the rainbow or a prims is spectral colors.
There is also extra-spectral color, that is colors that are not spectral colors, so you need multiple wavelengths of light or just no light. White is an extra-spectral color. It is light with a wavelength distribution just like the light from the sun on the surface of the earth. It will be made up of all spectral colors of light. The amount of light depends on the wavelength.
It is not just white that is an extra-spectral color; gray, black, brown, magenta, pink, etc is not something you can see if a single wavelength of light hit your eye.
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