Doppler effect | Definition, Example, & Facts | Britannica
https://www.britannica.com/science/Doppler-effect
webFeb 2, 2024 · Doppler effect, the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by relative motion of the observer and the wave source. This phenomenon is used in astronomical measurements, in Mössbauer effect studies, and in radar and modern navigation.
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