Q: 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 [Vrms (helium)]/[Vrms (argon)] is
(a) 0.32
(b) 0.45
(c) 2.24
(d) 3.16
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Ans: (d)