O-LevelPhysicsThermal Physics5054/11 · May/June 2025 · Q161 Mark
When a liquid evaporates, molecules escape from its surface. Which molecules escape, and what happens to the average kinetic energy of the molecules remaining in the liquid?
AThe less energetic molecules escape and the average kinetic energy decreases.
BThe less energetic molecules escape and the average kinetic energy increases.
CThe more energetic molecules escape and the average kinetic energy decreases.
DThe more energetic molecules escape and the average kinetic energy increases.
✓ Correct answer
C: The more energetic molecules escape and the average kinetic energy decreases.
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