O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2016 · Q181 Mark
A gas expands slowly and its temperature remains constant. What happens to the gas molecules?
AThey move further apart and their average speed decreases.
BThey move further apart and their average speed increases.
CThey move further apart and their average speed remains unchanged.
DThey stay the same distance apart and their average speed decreases.
✓ Correct answer
C: They move further apart and their average speed remains unchanged.
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