A small metal plate is held in a vacuum chamber, so it exchanges energy with its surroundings only by radiation. At first, the plate absorbs and emits radiation at an average power of 12 W. The power absorbed by the plate is then increased to 20 W. Immediately after this change, the power emitted by the plate is still 12 W.
Describe and explain how the temperature of the plate changes after the absorbed power is increased.
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.