单词	Doppler effect
释义	Doppler effect noun : a change in the frequency with which waves (as of sound or light) from a given source reach an observer when the source and the observer are in motion with respect to each other so that the frequency increases or decreases according to the speed at which the distance is decreasing or increasing Word History Etymology Christian J. Doppler First Known Use 1905, in the meaning defined above Medical Definition Doppler effect noun : a change in the frequency with which waves (as sound, light, or radio waves) from a given source reach an observer when the source and the observer are in motion with respect to each other so that the frequency increases or decreases according to the speed at which the distance is decreasing or increasing compare shift sense a
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