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Q.

The mean free path of molecules of a gas, (radius $' r'$ ) is inversely proportional to: -

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a

$r^{2}$

b

$r$

c

$\sqrt{r}$

d

$r^{3}$

answer is B.

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Detailed Solution

Mean free path $λ_{m} = \frac{1}{\sqrt{2} π d^{2} n}$

where $d =$ diameter of molecule

$n =$ molecular density

$\Rightarrow λ_{m} \propto \frac{1}{r^{2}}$

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