One train is approaching an observer at rest and another train is receding from him with the sam... VIDEO
One train is approaching an observer at rest and another train is receding from him with the same velocity \( 4 \mathrm{~m} / \mathrm{s} \). Both trains blow whistles of same frequency of \( 243 \mathrm{~Hz} \). The beat frequency in \( \mathrm{Hz} \) as heard by the observer is (speed of sound in air \( =320 \mathrm{~m} / \mathrm{s} \) )https://bit.ly/YTAI_PWAP https://www.pw.live
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