Two waves of same frequency and intensity superimpose on each other in opposite phases. After the superposition the intensity and frequency of waves will.

Options

A. decreases
B. increases
C. become zero
D. remains constant

Answer

D

Explanation

We know that interference is said to be constructive at point where resultant intensity is maximum (are in phase) and destructive at points where resultant intensity is minimum or 0 (zero are in opposite phase). Therefore, after the superposition, frequency and intensity of waves will remain constant.