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JEE Main20199 Jan 2019Morning ShiftPhysicsKinetic Theory of GasesActual

A mixture of 2 moles of helium gas (atomic mass = 4u) , and 1 mole of argon gas (atomic mass = 40 u) is kept at 300 K in a container. The ratio of their rms speeds V r m s h e l i u m V r m s ( a r g o n ) , is close to:

Options

  1. A0.45
  2. B2.24
  3. C0.32
  4. D3.16

Correct answer

D. 3.16

Step-by-step solution

V R M S = 3 R T M ∴   ( V R M S ) H e ( V R M S ) A r = M A r M H e = 40 4 = 10 =   3.16

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