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28 A boy is walking away from a wall at a speed of 1 0...

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28 A boy is walking away from a wall at a speed of 1 0 ms in a direction at right angles to the wall The boy blows a whistle steadily An observer towards whom the boy is moving hears 4 beats s If the speed of sound is 340 ms the frequency of whistle is a 480 Hz b 680 Hz c 840 Hz d 1000 Hz Observer Box Wall

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