O-LevelPhysicsThermal Physics5054/11 · May/June 2013 · Q161 Mark
When a gas in a container of fixed volume is heated, the pressure of the gas increases. Which statement explains this?
AThe molecules expand and get heavier, so they hit each other harder.
BThe molecules have less room to move, so they collide with each other more frequently.
CThe molecules hit the walls harder and less frequently.
DThe molecules move faster, so they collide with the walls more frequently.
✓ Correct answer
D: The molecules move faster, so they collide with the walls more frequently.
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