The Doppler Effect - Deepstash

The Doppler Effect

"But if you were traveling past Earth on a speeding rocket ship, you would see something different. Einstein used the formulas of relativ­ity to figure out that you would see the photons coming off the rock at a different frequency of light.

This is an effect called the relativis­tic Doppler effect, which is similar to how, for example, a police si­ren sounds different if the police car is coming toward or away from you.

In this case, though, the shift is a little stranger because of rel­ativity rules (since you can't see the photon going faster or slower than the speed of light).

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