If the molecular weight of two gases are ${\mathrm{M}}_{1}$ and  then at a temperature the ratio of root mean square velocity ${\mathrm{v}}_{1}$ and ${\mathrm{v}}_{2}$ will be

1. $\sqrt{\frac{{\mathrm{M}}_{1}}{{\mathrm{M}}_{2}}}$

2. $\sqrt{\frac{{\mathrm{M}}_{2}}{{\mathrm{M}}_{1}}}$

3. $\sqrt{\frac{{\mathrm{M}}_{1}+{\mathrm{M}}_{2}}{{\mathrm{M}}_{1}-{\mathrm{M}}_{2}}}$

4. $\sqrt{\frac{{\mathrm{M}}_{1}-{\mathrm{M}}_{2}}{{\mathrm{M}}_{1}+{\mathrm{M}}_{2}}}$

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