An engine running at speed v/10 sounds a whistle of frequency 600 Hz. A passenge

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An engine running at speed v/10 sounds a whistle of frequency 600 Hz. A passenger in a train coming from the opposite side at speed v/15 experiences this whistle to be of frequency f. If v is speed of sound in air and there is no wind, f is nearest to

Options:

A . 711 Hz

B . 630 Hz

C . 580 Hz

D . 510 Hz

Answer: Option A
:
A
As the source and the observer are approaching one another, so n’ would be larger.

f = (\frac{v + \frac{v}{15}}{v - \frac{v}{10}}) 600 = 711 H z

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