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Applications of Reflection of Sound

109.A train m...

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109.A train moving at a speed of 220 ms1 towards a stationary object, emits a sound of frequency 1000Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is :(speed of sound in air is 330 ms1) (1) 5000 Hz (2) 3000 Hz (3) 3500 Hz (4) 4000 Hz

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