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

1474 255 Kinetic Theory Report Error

A

8 : 9

19%

B

9 : 8

20%

C

$9 : 8$

32%

D

$8 : 9$

29%

Solution:

$\frac{C _{1}}{C _{2}} = \frac{ρ _{2}}{ρ _{1}} = \frac{9}{8}$