Two Sinusoidal Waves Have the Same Angular Frequency, the Same

Multiple Choice

Two sinusoidal waves have the same angular frequency, the same amplitude y_m, 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) 0.64 y_m
B) 1.3 y_m
C) 0.91 y_m
D) 1.8 y_m
E) 0.35 y_m