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JEE Advanced2012PhysicsKinetic Theory of GasesActual

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 ( v_ rms ( helium ) v_ rms ( argon ) ) is

Options

  1. A0.32
  2. B0.45
  3. C2.24
  4. D3.16

Correct answer

D. 3.16

Step-by-step solution

Using V_ rms = 3 R T M V_ r m s 1 M v_ rms (helium) v_ rms (argon) = M_ argon M_ helium = 40 4 = 10 3.16

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