The mean free path for a gas, with molecular diameter $d$ and number density $n$ can be expressed as :
A$\frac{1}{\sqrt{2} n ^{2} \pi^{2} d ^{2}}$
B$\frac{1}{\sqrt{2} n \pi d }$
C$\frac{1}{\sqrt{2} n \pi d ^{2}}$
D$\frac{1}{\sqrt{2} n ^{2} \pi d ^{2}}$
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C$\frac{1}{\sqrt{2} n \pi d ^{2}}$
c Mean free path for a gas sample
$\lambda_{ m }=\frac{1}{\sqrt{2} \pi d ^{2} n }$
where $d$ is diameter of a gas molecule and $n$ is molecular density
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