A mixture of 2 moles of helium gas (atomic mass =4 u ), and 1 mole of argon gas (atomic mass =40 u ) is kept at 300 K in a container. The ratio of…

A mixture of $\displaystyle 2$ moles of helium gas (atomic mass $\displaystyle =4 \mathrm{u}$ ), and $\displaystyle 1$ mole of argon gas (atomic mass $\displaystyle =40 \mathrm{u}$ ) is kept at $\displaystyle 300$ K in a container. The ratio of their rms speeds $\displaystyle \left[\frac{\mathrm{V}_{\text {rms }}(\text { helium })}{\mathrm{V}_{\text {rms }}(\text { argon })}\right]$, is close to :