Question

What is doppler shift? Explain

Answer 1

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Doppler shift is the phenomenon that explains frequency shift of sound waves (longitudinal pressure waves through material medium) due to motion of source or receiver.

Doppler shift is the shift in the frequency of a wave due to a moving source.

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Answer 2

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.[1] It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.

The reason for the Doppler effect is that when the source of the waves is moving towards the observer, each successive wave crest is emitted from a position closer to the observer than the crest of the previous wave.Therefore, each wave takes slightly less time to reach the observer than the previous wave. Hence, the time between the arrival of successive wave crests at the observer is reduced, causing an increase in the frequency.