First slide

Reflection and transmission

Question

When a sound wave is reflected from a wall, the phase difference between the reflected and incident pressure wave is:

Difficult

A

0
B

$π$
C

$\frac{π}{2}$
D

$\frac{π}{4}$

Solution

When a sound wave gets reflected from a rigid boundary, the particles at the boundary are unable to vibrate. Thus, a reflected wave is generated which interferes with the oncoming wave to produce zero displacement at the rigid boundary. At these points (zero displacement), the pressure variation is maximum. Thus, a reflected pressure wave has the same phase as the incident wave.

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