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
B
326 Hz
C
334 Hz
D
330 Hz

Solution

## The correct option is A 332 HzTo apply doppler affect consider wall as a mirror so,O' will produce echo because it is obtained by reflection.$$\eta=334(\cfrac{330-2}{330})=332Hz$$Physics

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