JEE Main 2022 Physics question
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.
Answer: 340
Solution
The speed of the train is = m/s. The hill receives the sound of the approaching source and acts as a stationary source of frequency
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