Which of the following properties of molecules of a gas is same for all gases at particular temperature ?
Correct answer: D. kinetic energy
- A. momentum
- B. mass
- C. velocity
- D. kinetic energy
Explanation
The mean translational kinetic energy of a gas molecule is 3kT/2, so at the same temperature it has the same average value for all ideal gases. The likely mistake is choosing velocity, because gases have different molecular masses and therefore do not have the same average molecular speed at a fixed temperature.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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