Question

The velocity of sound in oxygen is less than in helium.

• A. True
• B. False

Answer 1

The correct option is A True

Formula for Velocity of Sound in a Gas is; $v=(\gamma RT/M{)}^{1/2}$, where $\gamma$ is adiabatic index of gas, $R$ and $T$ are universal gas constant and temperature of gas and $M$ is the molecular weight of gas.

Now, ${\gamma }_o=7/5$ and of ${\gamma }_{he}=5/3$

Also, $M_o=32$ and that of $M_{He}=4$

so, byputting known values in velocity formula we get;

Velocity of sound in Oxygen is less than in Helium.

Hence, the given statement is $True$