The Mean Free Path $\ell$ for a gas molecule depends upon diameter, $d$ of the molecule as
A$\ell \propto \frac{1}{d}$
B$\ell \propto \frac{1}{d^{2}}$
C$\ell \propto d$
D$\ell \propto d^{2}$
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B$\ell \propto \frac{1}{d^{2}}$
b Mean free path $(\ell)$
$\ell=\frac{1}{\sqrt{2} n \pi d^{2}}$
$\ell \propto \frac{1}{d^{2}}$
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