Making use of Energy 3.3 (a) how temperature differences lead to the transfer of energy thermally by radiation.

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Presentation transcript:

Making use of Energy 3.3 (a) how temperature differences lead to the transfer of energy thermally by radiation

Starter – pairs

Heat radiation Heat radiation is invisible to the human eye but the radiation from hot bodies can be felt by your hand. The proper name for heat radiation is INFRA RED RADIATION. All objects emit heat radiation. If we take two objects of the same material and the same size but at different temperatures the one which is hotter will emit more radiation. Two objects of the same material and the same temperature but of different sizes emit different amounts of heat radiation – the bigger one emitting more radiation than the smaller one.

Infrared Radiation ___ objects transfer heat by radiation in the form of infra-red _____. Radiation is the only way heat can be transferred through a ______. _____ surfaces absorb radiation quickly, but _____ surfaces _______ radiation. Dark Waves Reflect Hot Shiny Vacuum

Investigation of heat transfer – radiation Use tape to attach a 2cm strip of black paper to the bulb of one thermometer. In the same way attach a 2cm strip of silver foil to the bulb of another thermometer. Clamp the 2 thermometers the same distance away (about 10cm) from a filament lamp. Record the temperatures shown by the two thermometers. Switch on the lamp and record the temperatures again after 10minutes

Exam style question

School physics heat transfer quiz Plenary School physics heat transfer quiz