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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 ms⁻¹. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be

1. zero
2. 4
3. 8
4. 2

Correct answer: zero

Solution

The listener moves between two sources of the same frequency (660 Hz). Since the relative velocity between the listener and both sources is the same, there is no frequency difference, and hence no beats are heard.

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