Relativistic Doppler effect

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What Wikipedia says

The relativistic Doppler effect is the change in frequency, wavelength and amplitude of light, caused by the relative motion of the source and the observer (as in the classical Doppler effect, first proposed by Christian Doppler in 1842), when taking into account effects described by the special theory of relativity.

Excerpt from the Wikipedia article “Relativistic Doppler effect”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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