O-LevelPhysicsThermal Physics5054/11 · May/June 2021 · Q151 Mark
A copper rod is heated at one end. Which statement describes how heat transfer occurs in the copper?
AEnergetic copper molecules move from the cooler end to the hotter end.
BEnergetic copper molecules move from the hotter end to the cooler end.
CEnergetic free electrons move from the cooler end to the hotter end.
DEnergetic free electrons move from the hotter end to the cooler end.
✓ Correct answer
D: Energetic free electrons move from the hotter end to the cooler end.
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