> An interesting question is whether radio waves, gamma radiation, and visible light all travel an identical speed through atmosphere.
They don't. The index of refraction tells you about how the speed of light is changed by a medium, and the fact that it's different for different colors of visible light is why you get effects like rainbows.
They don't. The index of refraction tells you about how the speed of light is changed by a medium, and the fact that it's different for different colors of visible light is why you get effects like rainbows.
This stack exchange question might interest you if you'd like to read more: https://physics.stackexchange.com/questions/196803/why-is-th... .