The root mean square velocity of a gas molecule of mass $m$ at a given temperature is proportional to
A${m^0}$
B$m$
C$\sqrt m $
D$\frac{1}{{\sqrt m }}$
AIPMT 1990, Easy
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D$\frac{1}{{\sqrt m }}$
d ${v_{rms}} = \sqrt {\frac{{3kT}}{m}} = {v_{rms}} \propto \frac{1}{{\sqrt m }}$
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