A source of sound of frequency $n$ is moving towards a stationary observer with a speed $S.$ If the speed of sound in air is $V$ and the frequency heard by the observer is ${n_1}$, the value of ${n_1}/n$ is
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(d) By using $n' = n\frac{v}{{v - {v_S}}}$
==> $\frac{{{n_1}}}{n} = \left( {\frac{V}{{V - S}}} \right)$
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