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QUESTION
Fully constructive interference between two sinusoidal waves of the same frequency occurs only if they:
Fully constructive interference between two sinusoidal waves of the same frequency occurs only if they:
a)travel in the same direction and are 180° out of phase
b)travel in opposite directions and are in phase
c)travel in the same direction and are in phase
d)travel in the same direction and are 90° out of phase
e)travel in opposite directions and are 180° out of phase
