A ceramic tile in an evacuated furnace initially has a steady temperature. It absorbs and emits radiation at an average power of 45 W. The furnace walls are then allowed to cool, so the tile now absorbs radiation at an average power of 30 W. At its original temperature, the tile still emits radiation at 45 W. Which describes the tile as it reaches a new steady temperature?
The tile's internal energy increases and its emitted power falls to 30 W.
The tile's internal energy decreases and its emitted power falls to 30 W.
The tile's internal energy stays constant and its emitted power stays at 45 W.
The tile's internal energy decreases and its emitted power stays at 45 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.