O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2015 · Q181 Mark
Some of the liquid in a dish evaporates, as shown in the diagrams. Which molecules leave the liquid and which molecules in the liquid have greater average kinetic energy?
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Amolecules that leave have high energy, molecules in the liquid have greater average kinetic energy before evaporation
Bmolecules that leave have high energy, molecules in the liquid have greater average kinetic energy after evaporation
Cmolecules that leave have low energy, molecules in the liquid have greater average kinetic energy before evaporation
Dmolecules that leave have low energy, molecules in the liquid have greater average kinetic energy after evaporation
✓ Correct answer
A: molecules that leave have high energy, molecules in the liquid have greater average kinetic energy before evaporation
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