Question

Two sinusoidal waves have the same angular frequency, the same amplitude ym, and travel in the same direction in the same medium. If they differ in phase by 50°, the amplitude of the resultant wave is given by
A) 0.64ym
B) 1.3 ym
C) 0.91ym
D) 1.8 ym
E) 0.35 ym

Answer

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