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

(a) 4 

(b) 3

(c) 2 

(d) 1.

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(a) : The given sources of sound produce frequencies, (υ – 1), υ and (υ + 1).
For two sources of frequencies u1 and υ2,
y1 = A cos2πυ1t
y2 = A cos2πυ2t
Superposing, one gets

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