The internal energy of real gases is determined by which of the following?

Calculate the mean free path and relaxation time for a gas with a mean speed $\langle v \rangle = 485 \ m/s$. Assume standard conditions $(STP)$ where the number density $n \approx 2.7 \times 10^{25} \ m^{-3}$ and molecular diameter $d = 2 \ \mathring{A}$.

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

According to the Kinetic Theory of Gases,which of the following statements is correct?

An ideal gas $A$ and a real gas $B$ have their volumes increased from $V$ to $2V$ under isothermal conditions. The increase in internal energy
[$AIPMT$ $1993$]

If the molecular radius of hydrogen gas is $0.5 \ \mathring A$,then the mean free path of hydrogen gas molecules at $0 \ ^\circ C$ temperature and $1 \ atm$ pressure is ........ $\mathring A$. (Given $k_B = 1.38 \times 10^{-23} \ J \ K^{-1}$)