A small instrument housing is tested in a chamber. It exchanges energy only by radiation. The average powers during two intervals are shown.
| Interval | Time | Average power absorbed | Average power emitted |
|---|---|---|---|
| 1 | 100 s | 120 W | 85 W |
| 2 | 80 s | 70 W | 100 W |
Calculate the change in the internal energy of the housing over the two intervals.
96 exam-style questions on Edexcel GCSE Physics 5.3 Black body radiation, covering 5.3.1 Emission of radiation and temperature, 5.3.2 Radiation balance and constant temperature, and 5.3.3 The temperature of the Earth. Each one has a worked solution and a mark scheme showing where the marks go.