A wall-mounted hot-water radiator is used to heat a study room.
Explain how thermal energy from the radiator warms the air in the room by convection. Use your ideas about the density of air.
Some radiators are designed with a dull, black finish. Explain how a dull, black surface helps to transfer more thermal energy to the room.
A sheet of shiny foil is attached to the wall directly behind the radiator. Explain how the shiny foil helps to keep the room warm.
62 exam-style questions on CIE IGCSE Physics 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.