Doppler effect

noun

Definition of Doppler effect 

: 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

First Known Use of Doppler effect

1905, in the meaning defined above

History and Etymology for Doppler effect

Christian J. Doppler

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The first known use of Doppler effect was in 1905

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Doppler effect

noun

Medical Definition of Doppler effect 

: 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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