Two identical heated panels are designed to transfer energy to a room by infrared radiation. The panels have the same surface area and are at the same temperature, but each has a different surface finish.
The table shows the fraction of incident infrared radiation absorbed by each surface.
| Surface finish | Fraction of incident infrared radiation absorbed |
|---|---|
| R | 0.34 |
| S | 0.91 |
Explain which panel emits more infrared radiation each second.
The electrical supply to panel S is switched off. At one instant, the panel absorbs 120 J of infrared radiation each second and emits 460 J of infrared radiation each second.
Explain what happens to the temperature of panel S at this instant.
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.