First slide

Beats

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

Easy

A

1
B

4
C

3
D

2

Solution

beat frequency $f_{2} - f_{1}$ $= (n = 1) - (n - 1) = 2$

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