An electric radiator is used to heat a room. The radiator becomes warm and transfers thermal energy to the surroundings.
State the region of the electromagnetic spectrum that is responsible for this transfer of thermal energy.
State:
one similarity between the radiation identified in (a) and ultraviolet radiation.
one difference between the radiation identified in (a) and ultraviolet radiation.
Describe an experiment, using two identical containers with different surface finishes (e.g., matt black and shiny silver), to demonstrate which surface is the better emitter of thermal radiation.
State two quantities in this experiment that must be kept constant to ensure a fair test.
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.