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Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 ms. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be (a) zero (c) 8 (b) 4 (d) 2

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