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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
874136_498935158be14fde8f4b3e6b6dce6d24.png


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.
$$\eta=334(\cfrac{330-2}{330})=332Hz$$

1152130_874136_ans_dab712f25aec4677a96737fd2c3efe5e.png

Physics

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