Q. $v_{1}$ and $v_{2}$ are the velocities of sound at the same temperature in two monoatomic gases of densities $\rho_{1}$ and $\rho_{2}$ respectively. If $\rho_{1}/\rho_{2} = \frac{1}{4}$ then the ratio of velocities $v_{1}$ and $v_{2}$ will be

A) $1\ :2$
B) $4\ :1$
C) $2\ :1$
D) $1\ :4$
Explanation

(c) At given temperature and pressure
$v \propto \frac{1}{\sqrt{\rho}} \Rightarrow \frac{v_{1}}{v_{2}} = \sqrt{\frac{\rho_{2}}{\rho_{1}}} = \sqrt{\frac{4}{1}} = 2\ :1$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

Want more practice?
Practice Waves MCQs