Explain why the absorber pipes in a solar water heater are painted matt black. Use ideas about the transfer of thermal energy in your answer.
As a hot metal block is removed from a furnace and allowed to cool, its temperature decreases. State what happens to the rate of emission of thermal radiation from the block.
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.