The speed of sound in air at a given temperature is $350 m/s$. An engine blows whistle at a frequency of $1200 \,cps$. It is approaching the observer with velocity $50 m/s$. The apparent frequency in cps heard by the observer will be
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(c) $n' = n\,\left( {\frac{v}{{v - {v_s}}}} \right) = 1200\,\, \times \left( {\frac{{350}}{{350 - 50}}} \right)=1400\, cps$
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