In a radiation test chamber, a metal component initially absorbs radiation at an average power of 300 W and emits radiation at an average power of 300 W. The chamber is adjusted so that the component absorbs radiation at an average power of 380 W. At its original temperature, the component still emits radiation at an average power of 300 W. Which pair gives the component's temperature change and its emitted power when a new steady temperature is reached?
It warms; its emitted power is 380 W.
It cools; its emitted power becomes 380 W.
It warms; its emitted power remains at 300 W.
Its temperature stays the same; its emitted power remains at 300 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.