A mixture of $2$ moles of helium gas (atomic mass $=4 \ amu$ ), and $1$ mole of argon gas (atomic mass $=40 \ amu$ ) is kept at $300 \ K$ in a container. The ratio of the rms speeds $\left(\frac{\left. v _{ mms } \text { (helium }\right)}{ v _{\text {rms }} \text { (argon) }}\right)$ is :
IIT 2012, Advanced
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