To what temperature should the hydrogen at $327°C$ be cooled at constant pressure, so that the root mean square velocity of its molecules become half of its previous value ....... $^oC$
A$-123$
B$123$
C$-100$
D$0$
Medium
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A$-123$
a ${v_{rms}} \propto \sqrt {\frac{{3RT}}{M}} \, \Rightarrow \,\,T \propto {v^2}_{rms}$
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