Question

Velocity of sound in air is

• A. Faster in dry air than in moist air
• B. Directly proportional to the pressure
• C. Directly proportional to temperature
• D. Independent of the pressure of air

Answer 1

The correct option is D Independent of the pressure of air

The velocity of sound in the medium is given by:

$v=\sqrt{\frac{\gamma P}{\rho }};$

as $P$ changes, $\rho$ also changes.

Hence $\frac{P}{\rho }$ remains constant so speed remains constant.