A student sits 1.5 m away from an electric patio heater outdoors on a cool evening. As soon as the heater is turned on, the student feels the warmth on their face almost immediately.
How is thermal energy transferred from the patio heater to the student so quickly?
by conduction, convection, and radiation
by conduction only
by convection only
by radiation only
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.