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Kinetic Theory of Gases — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsKinetic Theory of Gases1 Mark
MCQ
Consider a mixture of oxygen and hydrogen kept at room temperature. AB compared to a hydrogen molecule an oxygen molecule hits the wall:
  • A
    With greater average speed.
  • ✓
    With smaller average speed.
  • C
    With greater average kinetic energy.
  • D
    With smaller average kinetic energy.
✓

Answer

Correct option: B.
With smaller average speed.
Explanation:
The average speed of molecules is given by $\sqrt{\frac{8\text{kT}}{\pi\text{m}}}.$
We observe that greater the mass, lesser is the average speed of the molecule. Since an oxygen molecule is heavier than a hydrogen molecule, the oxygen molecule will hit the wall with smaller average speed.

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