O-LevelPhysicsThermal Physics5054/12 · May/June 2020 · Q281 Mark
The air in a sealed can is heated. Which statement explains the increase in pressure inside the can?
AThe molecules collide with the walls of the can more frequently when the air is heated.
BThe mass of the molecules is greater when the air is heated.
CThere are more molecules per unit volume when the air is heated.
DThe separation of molecules becomes greater when the air is heated.
✓ Correct answer
A: The molecules collide with the walls of the can more frequently when the air is heated.
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