How does the amplitude of the resultant wave vary with phase difference φ? - OSCILLATIONS AND WAVES Quiz | GKFix.in

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Question

How does the amplitude of the resultant wave vary with phase difference φ?

A. It is constant at a
B. It varies as a sin φ
C. It varies as 2a cos(φ/2)
D. It varies as 2a sin(φ/2)