Question

Which of the following graphs represent the correct variation of velocity $\left(v\right)$ of sound with the pressure $\left(P\right)$ in a gas at constant temperature?

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

We know that the velocity of sound in a gas is given by,
$v=\sqrt{\frac{\gamma RT}{M}}$
At constant temperature, we can see that velocity is independent of pressure variation.
Hence, velocity will remain constant as pressure changes.
So, option $\left(d\right)$ is correct.