A Siren emitting sound of frequency $800 \;Hz$ is going away from a static listener with a speed of $30\; m/s$, frequency of the sound to be heard by the listener is... $Hz$ (take velocity of sound as $330 \;m/s$)
AIIMS 2002, Medium
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(a) $n' = n\,\left( {\frac{v}{{v + {v_S}}}} \right) = 800\,\left( {\frac{{330}}{{330 + 30}}} \right)\, = 733.33\,Hz$.
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