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Question

Three sound waves of equal amplitudes have frequencies (n  1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be


A
3
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B
2
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C
1
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D
4
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Solution

The correct option is B 2
Net beat frequency = LCM of individual beat frequencies
= LCM of [(n, n1), (n, n+1), (n1, n+1)]
= LCM of (1, 1, 2)
= 2 Hz
So, no. of beats per second = 2

Physics

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