Consider a gas for which diameter of molecules is $\sigma $ , the gas is at a pressure $P$ and temperature $T$ and $N_a =$ avagodro’s number. The mean free path along $x$ axis is 
  • A$\frac{{RT}}{{\sqrt 2 P{N_a}\pi {\sigma ^2}}}$
  • B$\frac{{RT}}{{\sqrt 3 P{N_a}\pi {\sigma ^2}}}$
  • C$\frac{{RT}}{{\sqrt 6 P{N_a}\pi {\sigma ^2}}}$
  • D$\frac{{RT}}{{P{N_a}\pi {\sigma ^2}}}$
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