If the diameter of a gas molecule is very small,what will be the mean free path?

$A$ real gas behaves as an ideal gas at

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?

An ideal gas is enclosed in a cylinder at a pressure of $2 \, atm$ and a temperature of $300 \, K$. The mean time between two successive collisions is $6 \times 10^{-8} \, s$. If the pressure is doubled and the temperature is increased to $500 \, K$,the mean time between two successive collisions will be close to:

What is mean free path?

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.