Two identical enclosures for weather-monitoring equipment are outside in sunshine. One enclosure has a polished metal surface and the other has a matt black surface.
The enclosures are at the same temperature. Only energy transferred by radiation needs to be considered. None of the radiation incident on the enclosures is transmitted.
| Surface | Power of incident radiation in W | Power of reflected radiation in W | Power of emitted radiation in W |
|---|---|---|---|
| Polished metal | 500 | 425 | 95 |
| Matt black | 500 | 40 | 180 |
Calculate the overall rate at which each enclosure gains or loses energy.
Explain what will happen to the temperature of each enclosure at this moment.
106 exam-style questions on AQA GCSE Physics 6.3 Black body radiation, covering 6.3.1 Emission and absorption of infrared radiation and 6.3.2 Perfect black bodies and radiation. Each one has a worked solution and a mark scheme showing where the marks go.