Question
Explain why (or how):
(a) In a sound wave, a displacement node is a pressure antinode and vice versa,
Solution
A node (N) is a point where the amplitude of vibration is the minimum and pressure is the maximum.
An antinode (A) is a point where the amplitude of vibration is the maximum and pressure is the minimum.
Therefore, a displacement node is nothing but a pressure antinode, and vice versa.
