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

question 12

Multiple Choice

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.

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