MHT CET Physics question
A train approaching a hill at a speed of 40 km/h sounds a whistle of frequency 580 Hz when it is at a distance of 1 km from a hill. A wind with a speed of 40 km/h is blowing in the direction of motion of train. Find the frequency of the whistle as heard by an observer on the hill. (Take, speed of sound in air = 1200 km/h)
Answer: (C)
Solution
Wind along the direction of propagation gives an effective sound speed of km/h, so Hz (the observer
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