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Question: Answered & Verified by Expert
If m' represents the mass of each molecules of a gas and $T^{\prime}$ ' its absolute temperature, then the root mean square speed of the gas molecule is proportional to
PhysicsKinetic Theory of GasesMHT CETMHT CET 2021 (23 Sep Shift 2)
Options:
  • A $\mathrm{m}^{-\frac{1}{2}} \mathrm{~T}^{\frac{1}{2}}$
  • B $\mathrm{mT}$
  • C $\mathrm{~m}^{\frac{1}{2}} \mathrm{~T}^{-\frac{1}{2}}$
  • D $\mathrm{~m}^{\frac{1}{2}} \mathrm{~T}^{\frac{1}{2}}$
Solution:
2852 Upvotes Verified Answer
The correct answer is: $\mathrm{m}^{-\frac{1}{2}} \mathrm{~T}^{\frac{1}{2}}$
$\begin{aligned} & \mathrm{v}=\sqrt{\frac{3 \mathrm{RT}}{\mathrm{M}}}=\sqrt{\frac{3 \mathrm{RT}}{\mathrm{mN}_{\mathrm{A}}}} \\ & \therefore \mathrm{v} \propto \mathrm{m}^{-\frac{1}{2}} \mathrm{~T}^{\frac{1}{2}}\end{aligned}$

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