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Finding Average Velocity

A stationary ...

Question

A stationary sound source 's' of frequency 334 Hz and a stationary observer 'O' are placed near a reflecting surface moving away from the source with velocity 2 m/sec as shown in the figure. If the velocity of the sound waves is air is V = 330 m/sec, the apparent frequency ofthe echo is

A

332 Hz

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B

326 Hz

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C

334 Hz

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D

330 Hz

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Solution

The correct option is A 332 Hz
To apply doppler affect consider wall as a mirror so,
O' will produce echo because it is obtained by reflection.
$η = 334 (\frac{330 - 2}{330}) = 332 H z$

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