Mean free path of the molecules of an ideal gas at pressure p and temperature T is $\lambda$. What will be the mean free path of the same gas at pressure p/2 and temperature T?

• A

  $\raisebox{1ex}{$\lambda $}\!\left/ \!\raisebox{-1ex}{$2$}\right.$

• B

  $2\lambda$

• C

  $\lambda$

• D

  $4\lambda$