Some electric cookers have solid metal hobs that do not glow when hot.
Other electric cookers have glass-ceramic hobs with a heater underneath that glows bright red.
With both cookers, a metal pan is placed in direct contact with the hob so that there is no air gap between them.
Which statement is correct?
The glass-ceramic hob transfers energy to the base of the pan by convection.
The glass-ceramic hob transfers less energy by radiation to the base of the pan than the metal hob.
The metal hob transfers energy to the base of the pan by conduction.
The metal hob transfers energy to the base of the pan by convection.
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.