Question

The phase difference between the displacement wave and the pressure wave in sound wave is

• A. $\frac{\pi }{3}$
• B. $\frac{\pi }{2}$
• C. $\frac{\pi }{4}$
• D. $\frac{\pi }{6}$

Answer 1

The correct option is B $\frac{\pi }{2}$

The amplitude of oscillation of pressure in the medium is maximum where the displacement of the particle of the medium is zero and vice-versa.
Hence, pressure wave and displacement wave are out of phase by $\frac{\pi }{2}$.