Question

The average pressure exerted on the walls of a container filled with a certain gas will be doubled if:

• A. the average speed of molecules gets double.
• B. The average velocity of molecules gets double.
• C. the mean square velocity of molecules gets double.
• D. The root means square velocity of molecules gets double.

Answer 1

The correct option is D The root means square velocity of molecules gets double.

Hence we know that according to kinetic theory of molecules pressure $P=k\times$ rms velocity. Hence pressure will be doubled if root means square velocity of molecules gets double.