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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