Scientists measure radiation for the same area of Earth before and after a change to its surface. The incoming solar power is unchanged. Assume that all other factors affecting Earth's radiation balance remain unchanged.
| Surface condition | Incoming solar power | Reflected solar power |
|---|---|---|
| Before the change | 1200 W | 420 W |
| After the change | 1200 W | 300 W |
Calculate the solar power absorbed before the change and after the change.
Explain the effect of the change on the average temperature of Earth.
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.