Quantum Physics

How do light waves influence color?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. A light wave's frequency determines its color. Bunched-up waves produce bluer colors, and waves that are stretched out -- and therefore lower in frequency -- produce redder colors. If an astronomer were to use a telescope to observe a galaxy rushing toward Earth, the galaxy would produce light waves that bunch up as it approaches the telescope, increasing the waves' frequency and causing them to appear as a color on the blue end of the spectrum. If the galaxy were rushing away from Earth, it would produce light waves that spread apart as it recedes from the telescope, decreasing the waves' frequency and causing them to appear as a color on the red end of the spectrum.

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