As a sound wave completes one cycle, at 180°:
A) the air pressure is normal but about to increase
B) the air pressure is normal but about to decrease
C) the wave has reached the maximum pressure
D) the wave has reached the minimum pressure

Question

Quizplus · Accepted Answer

At 180° in a sound wave cycle, the wave is at the midpoint of a compression or rarefaction, meaning the air pressure is normal but about to decrease as it moves towards rarefaction.

As a Sound Wave Completes One Cycle, at 180°