For 1 mole of gas, the average kinetic energy is given as E. The ${\mathrm{u}}_{\mathrm{r}\mathrm{m}\mathrm{s}}$ of gas is

• Correct answer
  A

  ${\left[\frac{2\mathrm{E}}{\mathrm{M}}\right]}^{1/2}$
• B

  ${\left[\frac{3\mathrm{E}}{\mathrm{M}}\right]}^{1/2}$
• C

  ${\left[\frac{2\mathrm{E}}{2\mathrm{M}}\right]}^{1/2}$
• D

  ${\left[\frac{3\mathrm{E}}{2\mathrm{M}}\right]}^{1/2}$

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