An observer moves towards a stationary source of sound of frequency $n$. The apparent frequency heard by him is $2n$. If the velocity of sound in air is $332\, m/sec, $ then the velocity of the observer is .... $m/sec$
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(c) $n' = n\,\left( {\frac{{v + {v_O}}}{v}} \right) $
$\Rightarrow 2n = n\,\left( {\frac{{v + {v_0}}}{v}} \right) $
$\Rightarrow \frac{{v + {v_0}}}{v} = 2$
$ \Rightarrow $ ${v_O} = v = 332 \,m/sec$
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