Two vessels of the same volume contain the same gas at same temperature. If the pressure in the vessels be in the ratio of $1 : 2$, then
  • Athe ratio of the average kinetic energy is $1 : 2$
  • Bthe ratio of the root mean square velocity is $1 : 1$
  • Cthe ratio of number of molecules is $1 : 2$
  • DBoth $(B)$ and $(C)$
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