(a)[1]
State the two kinds of radiation emitted by the heater.
(b)[4]
State and explain any changes that occur in the liquid levels when the heater is switched on.
Physics 0625 · IGCSE · Transfer of thermal energy
Transfer of thermal energy — practice question
Fig. 6.1 illustrates apparatus used to demonstrate some effects of energy transfer by radiation. The matt-black glass bulb, the shiny glass bulb and the spaces above the liquid in the tube each contain air. When switched on, the heater glows red. It is positioned the same distance from each bulb.