A test object is in a chamber where it exchanges energy only by radiation. The average powers absorbed and emitted during two consecutive intervals are shown in the table.
| Time interval | Average power absorbed | Average power emitted |
|---|---|---|
| 0 to 4.0 minutes | 180 W | 140 W |
| 4.0 to 10.0 minutes | 180 W | 160 W |
Calculate the total energy gained by the object during the 10.0 minutes. Give your answer in joules.
Explain what happens to the temperature of the object and its emitted power during the 10.0 minutes, and what happens after the second interval if the absorbed power remains at 180 W.
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.