Two passenger trains moving with a speed of $108\, km/hour$ cross each other. One of them blows a whistle whose frequency is $750 Hz.$ If sound speed is $330 m/s,$ then passengers sitting in the other train, after trains cross each other will hear sound whose frequency will be .... $Hz$
Medium
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(b) $n' = n\,\left( {\frac{{v - {v_o}}}{{v + {v_s}}}} \right) = 750\,\left( {\frac{{330 - 180 \times \frac{5}{{18}}}}{{330 + 108 \times \frac{5}{{18}}}}} \right) = 625$$Hz$
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