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Q.

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 speed of sound is 330 m/s, then after the trains cross each other, the passengers sitting in the other train will hear sound whose frequency will be

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a

900 Hz

b

625 Hz

c

750 Hz

d

800 Hz

answer is B.

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Detailed Solution

n' = n(v-vov+vs) = 750(330-180×518330+108×518) = 625 Hz
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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 speed of sound is 330 m/s, then after the trains cross each other, the passengers sitting in the other train will hear sound whose frequency will be