A copper rod is heated at one end. Thermal energy is transferred along the rod by conduction.
Which statement is not correct?
Delocalised electrons gain kinetic energy and move rapidly through the metal lattice.
Ions at the heated end vibrate with greater amplitude and transfer energy to neighbouring ions.
The transfer of thermal energy occurs as hot metal ions travel from the hot end to the cold end.
High-density solids generally conduct heat better than gases because their particles are closer together.
301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.