The root mean square speed of hydrogen molecules at 300K is 1930 m/s. then the root mean square speed of oxygen molecule at 900K will be
1930$\sqrt{3}$ m/s
838 m/s
643 m/s
$\dfrac{1930}{\sqrt{3}}$ m/s
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If at same temperature and pressure, the densities for two diatomic gases are respectively d1 and d2, then the ratio of velocities of sound in these will be