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A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5m/s. How many beats per second will be

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 A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5m/s. How many beats per second will be heard by the observer on source itself if sound travels at a speed of 330 m/s?

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Frequency heard by the observer due to S’ (reflected wave)

 Beat frequency fb = f’ – f = 7.87 Hz

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