Q16 of 36 Page 108

A train, standing in a station yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10m/s. Given that the speed of sound in still air is 340m/s,

There no relative motion between the train and the observer, so the frequency heard by the observer is same as the frequency produced by the train.

The wind is blowing at a speed of 10msec in the direction in which sound wave is travelling. So, net speed of sound wave is = (350+10) msec = 350 msec.

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