The frequency of echo will be _________ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h towards a hill from which an echo is heard by the train driver. Velocity of sound in air is 330 m/s.
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(340)
The hill will be a secondary source.
f 1 = frequency of the car w.r.t. the hill
f 2 = Frequency of the sound reflected by hill w.r.t. the car (echo)
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