A coated metal panel is heated by infrared lamps during a manufacturing process. Energy transfers by conduction and convection are negligible. The panel absorbs radiation at a constant rate of 84 J/s.
The table shows how the rate at which the panel emits radiation depends on its temperature.
| Temperature in °C | Rate of emission in J/s |
|---|---|
| 20 | 40 |
| 40 | 52 |
| 60 | 67 |
| 80 | 84 |
The panel starts at 20 °C. Assume that its rate of emission remains at the 20 °C value for the first 10 s.
Calculate the net energy transferred to the panel during the first 10 s.
Explain how the temperature of the panel changes after the first 10 s and predict its eventual steady temperature.
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.