$A$ container holds $10^{26} \text{ molecules/m}^3$ each of mass $3 \times 10^{-27} \text{ kg}$. Assume that $1/6$ of the molecules move with velocity $2000 \text{ m/s}$ directly towards one wall of the container while the remaining $5/6$ of the molecules move either away from the wall or in perpendicular direction,and all collisions of the molecules with the wall are elastic.

• A
  Number of molecules hitting $1 \text{ m}^2$ of the wall every second is $3.33 \times 10^{28}$.
• B
  Pressure exerted on the wall by molecules is $4 \times 10^5 \text{ Pa}$.
• C
  Pressure exerted on the wall by molecules is $24 \times 10^5 \text{ Pa}$.
• D
  Both $(A)$ and $(B)$.