Two waves of equal amplitude A, and equal frequency travel in the same direction

Question

Two waves of equal amplitude A, and equal frequency travel in the same direction in a medium. The amplitude of the resultant wave is

Options:

A . 0

B . A

C . 2A

D . between 0 and 2A

Answer: Option D
:
D
When two waves of amplitude A interfere the maximum amplitude is 2A and minimum is zero. The resultant amplitude in any general case is between 0 and 2A depending upon the phase difference.

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