The r.m.s. speed of gas molecules is given by

The number of molecules in a closed container is doubled. What will be the effect on $v_{rms}$?

For which gas is the $rms$ velocity maximum?

The temperature at which the r.m.s. velocity of hydrogen molecules is $4.5$ times that of an oxygen molecule at $47^{\circ}C$ is (molecular weights of hydrogen and oxygen are $2$ and $32$ respectively). (in $^{\circ}C$)

At what temperature $(K)$ will the $r.m.s.$ velocity of hydrogen gas be equal to the escape velocity from the Earth?

The $r.m.s.$ velocity will be greater for