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Finding Average Velocity

A railway eng...

Question

A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (f) of the sound heard by the observer is plotted against time (t). Which of the following best represents the resulting curve?

A

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B

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C

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D

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Solution

The correct option is B

$f_{1} = \frac{v}{v - v_{s}} f$ During approach

$& f_{2} = \frac{v}{v + v_{s}} f$ During separation

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