Question

When two sound waves of slightly different frequencies travelling along the same straight line in the same direction superimpose ,the intensity of sound alternates periodically with time. This phenomenon is called as _________ .
4)reverberation
2) epoch
3) echo
1) beats​

Answer 1

Answer:

When two waves of similar frequency arrive at the same point and superimpose, they alternately constructively and destructively interfere. This alternating is known as a beat because it produces an unpleasant pulsing sound.