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Kinetic Theory of Gases — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsKinetic Theory of Gases1 Mark
Question
Consider a mixture of oxygen and hydrogen kept at room temperature. AB compared to a hydrogen molecule an oxygen molecule hits the wall:
  1. With greater average speed.
  2. With smaller average speed.
  3. With greater average kinetic energy.
  4. With smaller average kinetic energy.
✓

Answer

  1. 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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