The ratio of average velocity to most probable velocity is

Which of the following gases will have the lowest root mean square speed at $25\,^{\circ}C$?

The most probable speed $(u_{mp})$ of $8 \ g$ of $H_2$ is $2 \times 10^2 \ ms^{-1}$. The kinetic energy (in $J$) of the same amount of $H_2$ gas is:

The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

The following graph is obtained for a gas at different temperatures $T_1$,$T_2$,$T_3$. What is the correct order of temperature? ($x$-axis $=$ velocity; $y$-axis $=$ number of molecules)

Helium diffuses four times faster than which of the following?