Question

The number of beats per second resulting from the vibration x1 = a cos 500 πt and x2 = a cos 508 πt is

(a) zero

(b) 2

(c) 4

(d) 8

Answer 1

Correct option: (c) 4

Explanation:

∆n = n2 – n1

= 508π / 2π - 500π / 2π = 4