If ${10}^{22}$ gas molecules each of mass ${10}^{-26}$ kg collides with a surface (perpendicular to it) elastically per second over an area $1\mathrm{ }{\mathrm{m}}^2$ with a speed ${10}^4\mathrm{m}/\mathrm{s},$ the pressure exerted by the gas molecules will be of the order of:

• Correct answer
  A

  $\mathrm{ }2\mathrm{ }\mathrm{P}\mathrm{a}$
• B

  $\mathrm{ }4\mathrm{ }\mathrm{P}\mathrm{a}$
• C

  $\mathrm{ }6\mathrm{ }\mathrm{P}\mathrm{a}$
• D

  $\mathrm{ }8\mathrm{ }\mathrm{P}\mathrm{a}$

Hence, the correct answer is option: 'A'.