Easy
If the molecular weights of two gases are $M_1$ and $M_2$,then at a constant temperature,the ratio of their root mean square velocities $v_1$ and $v_2$ will be:
- A$\sqrt{\frac{M_1}{M_2}}$
- B$\sqrt{\frac{M_2}{M_1}}$
- C$\sqrt{\frac{M_1 + M_2}{M_1 - M_2}}$
- D$\sqrt{\frac{M_1 - M_2}{M_1 + M_2}}$
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