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  4. The ratio of the vapour densities of two gases at the same temperature is 8: 9. The ratio of the rms velocities of their molecules is

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Q. The ratio of the vapour densities of two gases at the same temperature is $8: 9$. The ratio of the rms velocities of their molecules is

Kinetic Theory

Solution:

$\frac{C_{1}}{C_{2}}=\sqrt{\frac{\rho_{2}}{\rho_{1}}}=\sqrt{\frac{9}{8}}$