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Question

Two passenger trains moving with a speed of 108 km/hour cross each other.

One of them blows a whistle whose frequency is 750 Hz. If sound speed is

330 m/s, then passengers sitting in the other train, after trains cross each

other will hear sound whose frequency will be


A

900 Hz

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B

625 Hz

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C

750 Hz

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D

800 Hz

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Solution

The correct option is B

625 Hz


n' = n(vv0v+vs)=750(330180×518330+180×518)=325Hz


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