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单词 Doppler effect
释义 Doppler effect
 /dop"leuhr/, Physics.
 (often l.c.) the shift in frequency (Doppler shift) of acoustic or electromagnetic radiation emitted by a source moving relative to an observer as perceived by the observer: the shift is to higher frequencies when the source approaches and to lower frequencies when it recedes.
 [1900-05; named after C. J. Doppler (1803-53), Austrian physicist]
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