What is Dopplers 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. ... Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recessions
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The Dopplers effect refers to the change in wave Frequency During the relative motion between wave and source call Dopplers Effect.
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