A general condition that two waves undergo constructive interference is that
A) their phase difference is zero.
B) their phase difference is $\pi$/2 rad.
C) their phase difference is $\pm\pi$/2 rad.
D) their phase difference is an even integral multiple of $\pi$ rad.
E) their phase difference is an odd integral multiple of $\pi$ rad.

Question

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The Answer of A general condition that two waves undergo constructive interference is that
A) their phase difference is zero.
B) their phase difference is $\pi$/2 rad.
C) their phase difference is $\pm\pi$/2 rad.
D) their phase difference is an even integral multiple of $\pi$ rad.
E) their phase difference is an odd integral multiple of $\pi$ rad.

A General Condition That Two Waves Undergo Constructive Interference Is π\piπ

A General Condition That Two Waves Undergo Constructive Interference Is $\pi$