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. 1
• B. 4
• C. 3
• D. 2

Answer 1

Answer: (D)

2

Answer 2

Maximum difference of frequency $= (n + 1) - (n - 1) = 2$