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JEE Main201815 Apr 2018Evening ShiftPhysicsKinetic Theory of GasesActual

The value closest to the thermal velocity of a Helium atom at room temperature (300 ~K ) in ms ⁻¹ is: [ k _ B =1.4 10⁻²³ ~J / K ; m _ He =7 10⁻²⁷ ~kg ]

Options

  1. A1.3 10^4
  2. B1.3 10^5
  3. C1.3 10^2
  4. D1.3 10^3

Correct answer

D. 1.3 10^3

Step-by-step solution

aligned v &= 3 k_ B T / m_ He = 3 1.4 10⁻²³ 300 7 10⁻²⁷ &=1.34 10^3 ~m / s aligned

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