The Sum of Two Sinusoidal Traveling Waves Is a Sinusoidal

Multiple Choice

The sum of two sinusoidal traveling waves is a sinusoidal traveling wave only if:

A) their amplitudes are the same and they travel in the same direction
B) their amplitudes are the same and they travel in opposite directions
C) their frequencies are the same and they travel in the same direction
D) their frequencies are the same and they travel in opposite directions
E) their frequencies are the same and their amplitudes are the same