Two trains are moving towards each other at speeds of $20 m/s$ and $15 m/s$ relative to the ground. The first train sounds a whistle of frequency $600 Hz.$ the frequency of the whistle heard by a passenger in the second train before the train meets is ...... $Hz$ (the speed of sound in air is $340\, m/s$)
Medium
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(d) The frequency of whistle heard by passenger in the train $B$, is
$n' = n\,\left( {\frac{{v + {v_0}}}{{v - {v_s}}}} \right) = 600\,\left( {\frac{{340 + 15}}{{340 - 20}}} \right) \approx 666\;Hz$
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