A general condition for two coherent waves to undergo destructive interference is that
A) their phase difference is zero.
B) their phase difference is π/2 rad.
C) their phase difference is ±π/2 rad.
D) their phase difference is an even integral multiple of π rad.
E) their phase difference is an odd integral multiple of π rad.

Question

Quizplus · Accepted Answer

For two coherent waves to undergo destructive interference, their phase difference must be an odd integral multiple of π radians (π, 3π, 5π, etc.). This condition ensures that the waves are out of phase by half a wavelength, leading to cancellation.

A General Condition for Two Coherent Waves to Undergo Destructive