In the adjoining figure,various isothermals are shown for a real gas. Then

The mean free path of gas molecules depends on $(d =$ molecular diameter$)$

There are two identical chambers,completely thermally insulated from surroundings. Both chambers have a partition wall dividing the chambers into two compartments. Compartment $1$ is filled with an ideal gas and Compartment $3$ is filled with a real gas. Compartments $2$ and $4$ are vacuum. $A$ small hole (orifice) is made in the partition walls and the gases are allowed to expand into the vacuum.
Statement $-1$: No change in the temperature of the gas takes place when an ideal gas expands in a vacuum. However,the temperature of a real gas goes down (cooling) when it expands in a vacuum.
Statement $-2$: The internal energy of an ideal gas is only kinetic. The internal energy of a real gas is kinetic as well as potential.

Calculate the ratio of the mean free paths of the molecules of two gases having molecular diameters $1\,\mathring{A}$ and $2\,\mathring{A}$. The gases may be considered under identical conditions of temperature,pressure,and volume.

Mean free path of molecules in a polyatomic gas is independent of

At $S.T.P.$,the mean free path of a gas molecule is $1500 \ d$,where '$d$' is the diameter of the molecule. What will be the mean free path at $373 \ K$ at constant volume?