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

Options

A. 4
B. 3
C. 2
D. 1

Answer

C

Explanation

`v-1& v to 1 Beat`
`v+1& v to 1 Beat`
`v+1& v-1 to 2 Beat`
So, There will be 2 beats per sec.