The mean free path of molecules of a gas, (radius \( r \) ) is inve...

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The mean free path of molecules of a gas, (radius \( r \) ) is inversely proportional to
[CBSE PMT 2014]
\( \mathrm{W} \)
(a) \( r \)
(b) \( \sqrt{r} \)
(c) \( r^{3} \)
(d) \( r^{2} \)
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