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Forums
Physics
Special and General Relativity
Time Dilation vs. Doppler Effect: Similarities & Differences
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[QUOTE="vanhees71, post: 6567465, member: 260864"] One has to distinguish two cases: (a) Doppler effect for em. waves in the vacuum and (b) Doppler effect of other waves like sound waves. Case (a) is special, because here the Doppler effect only depends on the relative velocity beween transmitter and receiver, while in case (b) there is a preferred reference frame, the (local) rest frame of the medium the wave propagates in (for sound waves, e.g., the air). In all cases time dilation is part of the Doppler effect. In case (a) the transverse Doppler effect, i.e., the observer measures light emitted perpendicularly to the velocity of the source, is purely due to time dilation. For details, see [URL]https://itp.uni-frankfurt.de/~hees/pf-faq/rela-waves.pdf[/URL] [/QUOTE]
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Physics
Special and General Relativity
Time Dilation vs. Doppler Effect: Similarities & Differences
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