A woman sits on a chair in a cold room, two metres away from an electric fireplace. When she switches on the fireplace, she feels its warmth almost instantly.
How is thermal energy transferred from the fireplace to the woman so quickly?
by conduction only
by convection only
by radiation only
by conduction, convection, and radiation
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.