Question

A sound wave is traveling along positive x-direction. Displacement(s) of particles from their mean position at any time t is shown in the figure. Choose the correct alternative(s):

• A. Particle located at E has its velocity in negative y-direction.
• B. Particle located at D has zero velocity.
• C. Particles located near C are under compression.
• D. Change in pressure from equilibrium value at D is zero.

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

Particle located at E has its velocity in negative y-direction.

B

Particle located at D has zero velocity.

C

Particles located near C are under compression.

D

Change in pressure from equilibrium value at D is zero.

Particle located at D is at its extreme position. So its velocity is zero. Displacement and pressure variation from equilibrium have phase difference of $\frac{\pi }{2}$. So change in pressure from equilibrium value at D is zero. Rest answer is theory based.