Energy & Forces - Properties & uses of energy - Heat transfer - G25 - EF-F1.1

1	Infra-red detection using photodiodes.
2	Leslie’s Cube or monitor temperature fall of dull/polished cans of hot water. Data capture using thermometer probes.
3	Crookes radiometer.
4	Use vaseline to fix drawing pins to back of aluminium sheets one painted black, the other unpainted. Use IR lamp to heat the other side of the aluminium sheets. The energy absorbed melts the vaseline and the pins fall.
5	Monitor temperature rise of water in dull/polished cans exposed to IR lamp.
5	Dismantle and examine vacuum flask.

Energy & Forces - Properties & uses of energy - Heat transfer - G25
Development of Target EF-F1.1
LT-F1.1	Describe how energy is transferred by radiation
State that all hot objects emit heat as rays called infra red radiation.
State that infra-red radiation can travel without particles being present.
State that infra-red radiation travels very fast.
State that dull, dark surfaces are good at giving out and absorbing infra-red radiation.
State that shiny/white surfaces make poor emitters and absorbers of infra-red radiation.
State that bright shiny surfaces reflect infra-red radiation.
Explain the silvering on a vacuum flask in terms of absorption & emission of infra-red radiation.
Describe how the design of a vacuum flask reduces heat transfer by conduction, convection and radiation.