The engine of a train moving with speed 10,ms | vedclass

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(B) The Doppler effect occurs due to the relative motion between the source of sound and the observer.In this case,the passenger is inside the train,a

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$400$

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(B) The Doppler effect occurs due to the relative motion between the source of sound and the observer.In this case,the passenger is inside the train,and the engine (the source of the sound) is also part of the same train.Since both the source and the observer are moving together at the same velocity,their relative velocity is $0\,ms^{-1}$.Because there is no relative motion between the source and the observer,there is no shift in the frequency.Therefore,the frequency heard by the passenger is the same as the frequency produced by the whistle,which is $400\,Hz$.

The engine of a train moving with speed $10\,ms^{-1}$ towards a platform sounds a whistle at frequency $400\,Hz$. The frequency heard by a passenger inside the train is $........\,Hz$ (neglect air speed. Speed of sound in air $330\,ms^{-1}$). (in $,Hz$)

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