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$\frac{1}{\sqrt{2} n ^{2} \pi d ^{2}}$
NEET 2020, Easy
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