MCQ
The ratio of vapour densities of two gases at the same temperature is $\frac{4}{25}$, then the ratio of r.m.s. velocities will be :
- A$\frac{25}{4}$
- B$\frac{2}{5}$
- C$\frac{5}{2}$
- D$\frac{4}{25}$
✓
Answer
C.
$\frac{\rho_{1}}{\rho_{2}}=\frac{4}{25}$
Ratio of rms velocities $=\sqrt{\frac{\rho_{2}}{\rho_{1}}}=\frac{5}{2}$
$\frac{\rho_{1}}{\rho_{2}}=\frac{4}{25}$
Ratio of rms velocities $=\sqrt{\frac{\rho_{2}}{\rho_{1}}}=\frac{5}{2}$
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