One train is approaching an observer at rest and another train is receding him with same velocity4 ms^(-1). Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is (speed of sound in air=320ms^(-1) )

One train is approaching an observer at rest and another train is rece

1.	One train is approaching an observer at rest and another train is receding him with same velocity4 ms^(-1). Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is (speed of sound in air=320ms^(-1) )
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One train is approaching an observer at rest and another train is receding him with same velocity4 ms^(-1). Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is (speed of sound in air=320ms^(-1) )

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