Same chapter3 marksDifficulty: Medium
State the law of equipartition of energy and give the degrees of freedom of a monatomic and a diatomic gas molecule.
Behaviour of Perfect Gases and Kinetic Theory of Gases
3 marksDifficulty: Medium
What is mean free path, and on what does it depend?
Original Khojo Papers practice question — not from a past board paper.
Answer
The mean free path is the average distance a molecule travels between two successive collisions. It is inversely proportional to the number density of the molecules and to the square of their diameter, so it decreases as the pressure rises and increases as the temperature rises at constant pressure.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It is of the order of 10−7 m for air at ordinary pressure.
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