O-LevelPhysicsThermal Physics5054/11 · May/June 2012 · Q171 Mark
A rod of metal is heated at one end. Which statement best describes the conduction of heat through the metal?
AAtoms move from the hot end and hit electrons at the cold end.
BAtoms vibrate and hit atoms at the cold end.
CFree electrons move from the hot end and hit atoms further along the rod.
DFree electrons vibrate and pass energy to free electrons further along the rod.
✓ Correct answer
C: Free electrons move from the hot end and hit atoms further along the rod.
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