A ceramic test piece transfers energy only by radiation. During a 40 s interval, it absorbs radiation at a constant power of 84 W and emits radiation at an average power of 69 W. After this interval, its absorbed power is held constant at 69 W.
Calculate the energy gained by the test piece during the 40 s interval.
Explain what happens to the temperature of the test piece and its emitted power after the absorbed power changes, until its temperature becomes constant.
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.