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Q. A stationary sound source S of frequency 334 Hz and a stationary observer O are placed near reflecting surface moving away from the source with velocity 2m/s as shown in figure. Velocity of sound waves in air $v = 330$ m/s. The apparent frequency of echo is -
image

Waves

Solution:

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$F _{\text {echo }}= f _{ ac }\left[\frac{ V - V _{0}}{ V + V _{ s }}\right]$
$=334\left[\frac{330-2}{330+2}\right]$
$=334 \times \frac{328}{332}=330 Hz$