Question

Sound waves of frequency $600\ \text{Hz}$ fall normally on a perfectly reflecting wall. The shortest distance from the wall at which all particles will have maximum amplitude of vibration is (speed of sound $=300\ \text{ms}^{-1}$)}

• A. $\dfrac{1}{4}\ \text{m}$
• B. $\dfrac{1}{8}\ \text{m}$
• C. $\dfrac{3}{8}\ \text{m}$
• D. $\dfrac{7}{8}\ \text{m}$

Hint:

For sound reflection at a rigid wall, the wall is a displacement node. The nearest point of maximum particle vibration lies at a distance $\lambda/4$ from the wall.

Answer 1

The Correct Option is B