MCQ
At a given temperature the $r.m.s.$ velocity of molecules of the gas is
- ASame
- BProportional to molecular weight
- CInversely proportional to molecular weight
- ✓Inversely proportional to square root of molecular weight
✓
Answer
Correct option: D.
Inversely proportional to square root of molecular weight
d
${v_{rms}} = \sqrt {\frac{{3RT}}{M}} $ $\Rightarrow$ ${v_{rms}} \propto \frac{1}{{\sqrt M }}$
${v_{rms}} = \sqrt {\frac{{3RT}}{M}} $ $\Rightarrow$ ${v_{rms}} \propto \frac{1}{{\sqrt M }}$
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