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Revisiting Waves

Two passenger...

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' = $n (\frac{v - v_{0}}{v + v_{s}}) = 750 (\frac{330 - 180 \times \frac{5}{18}}{330 + 180 \times \frac{5}{18}}) = 325 H z$

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