The ratio of mean kinetic energy of hydrogen and nitrogen at temperature $300 \,K$ and $450\, K$ respectively is
A$3:2$
B$2:3$
C$2:21$
D$4:9$
Medium
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B$2:3$
b $\frac{{{E_1}}}{{{E_2}}} = \frac{{{T_1}}}{{{T_2}}} = \frac{{300}}{{450}} = \frac{2}{3}$
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