Which of the following is the expression of mean square speed of 'N' gas molecules contained in a cylinder?
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
Mean square speed is the average of the squares of the molecular speeds, <v^2> = (v1^2 + v2^2 + ... + vN^2)/N, which is the quantity appearing in PV = (1/3)Nm<v^2>. The choices in this paper were printed as diagrams rather than text, so learn the expression itself rather than the option label.
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Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.
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