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(A) The mean free path $(\lambda)$ of gas molecules is given by the formula: $\lambda = \frac{1}{\sqrt{2} \pi d^2 n}$,where $d$ is the diameter of the

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Mean free path increases

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(A) The mean free path $(\lambda)$ of gas molecules is given by the formula: $\lambda = \frac{1}{\sqrt{2} \pi d^2 n}$,where $d$ is the diameter of the molecule and $n$ is the number of molecules per unit volume.From this relation,it is clear that the mean free path $\lambda$ is inversely proportional to the number density $n$ $(\lambda \propto \frac{1}{n})$.Therefore,if the number of molecules per unit volume $(n)$ decreases,the mean free path $(\lambda)$ will increase.

What is the effect of a decrease in the number of molecules per unit volume on the mean free path?

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