Q. If $V_{m}$ is the velocity of sound in moist air, $V_{d}$is the velocity of sound in dry air, under identical conditions of pressure and temperature
A) $V_{m} < V_{d}$
B) $V_{m} > V_{d}$
C) $V_{m}V_{d} = 1$
D) $V_{m} = V_{d}$
Explanation
(b) From the relation, $v_{m} = \sqrt{\frac{\gamma p}{\rho}}$
Where, p=pressure of the gas
Ρ=density of the gas
Since, density of moist air is less than that of dry air
i.e., $\rho_{m} < \rho_{d}$
Therefore, $v_{m} > v_{d}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.