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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. (in integers)
Correct answer is '340'. Can you explain this answer?
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The frequency of echo will be ___________ Hz if the train blowing a wh...
The hill will be a secondary source.

f1 = frequency of the train w.r.t. the hill

f2 = frequency of the sound reflected by the hill w.r.t. the train (echo)
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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. (in integers)Correct answer is '340'. Can you explain this answer?
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