A laboratory tests four different coatings on identical ceramic tiles. All the outer surfaces of each tile are covered with one coating.
The tiles are at the same temperature and the same rate of infrared radiation is incident on each tile. The table shows the measured rate at which each tile absorbs energy.
| Coating | Rate of energy absorption in J/s |
|---|---|
| P | 14 |
| Q | 23 |
| R | 19 |
| S | 16 |
The tiles are then heated to the same higher temperature and placed in a cold vacuum chamber. Radiation is the only significant method of energy transfer, and the infrared radiation incident on the tiles from the chamber is negligible.
Explain which tile will initially cool fastest in the vacuum chamber.
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.