Practise designing infrared-emission tests comparing black and white surfaces, controlling variables and interpreting temperature change with CAIE IGCSE Physics questions and mark schemes.
Fig. 5.1 shows a heater in a bathroom.
Fig. 5.1
The heater is at a very high temperature and it glows red. The manufacturer states:
"The heater emits light and radiation and it transfers thermal energy by radiation."
Some surfaces are better at emitting radiation than others.
Describe an experiment to show whether a black surface or a white surface is the better emitter of radiation. You may draw a diagram.
To ensure that the conclusion reached in the experiment in (c)(i) is correct, several details of the experiment must be identical when testing the two different surfaces.
State two quantities in the experiment that you described that must be identical during the test.
1.
2.