what is Doppler effect
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The Doppler effect (or the Doppler shift) is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.
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When there is a relative motion between source of sound and observer, the apparent frequency heard by the observer differs from the actual frequency of the sound.
This motion related 'frequency change' is called "Doppler effect".
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