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Concepts Of Physics MCQ Edition [Volume 2]PhysicsKinetic Theory of Gases

At a given temperature, which of the following parameters is identical for the molecules of all gases?

Options

  1. ASpeed
  2. BKinetic energy
  3. CMass
  4. DMomentum

Correct answer

B. Kinetic energy

Step-by-step solution

According to the kinetic theory of gases, the average translational kinetic energy of a gas molecule is given by E = 3 2 kT , where k is the Boltzmann constant and T is the absolute temperature. Since k is a universal constant, the average kinetic energy depends only on the absolute temperature of the gas. Therefore, at a given temperature, the kinetic energy is identical for the molecules of all gases. Other parameters like speed, mass, and momentum depend on the nature of the gas and are not identical.

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