In two vessels of the same volume,atomic hydrogen and helium at pressures of $1\, atm$ and $2\, atm$ are filled,respectively. If the temperature of both samples is the same,then the average speed of hydrogen atoms $\langle C_H \rangle$ will be related to that of helium $\langle C_{He} \rangle$ as:

• A
  $\langle C_H \rangle = \sqrt{2} \langle C_{He} \rangle$
• B
  $\langle C_H \rangle = \langle C_{He} \rangle$
• C
  $\langle C_H \rangle = 2 \langle C_{He} \rangle$
• D
  $\langle C_H \rangle = \frac{\langle C_{He} \rangle}{2}$