If $m'$ represents the mass of each molecule of a gas and $T'$ its absolute temperature,then the root mean square speed of the gas molecule is proportional to

  • A
    $m^{-\frac{1}{2}} T^{\frac{1}{2}}$
  • B
    $mT$
  • C
    $m^{\frac{1}{2}} T^{-\frac{1}{2}}$
  • D
    $m^{\frac{1}{2}} T^{\frac{1}{2}}$

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