A thermal detector housing is at a constant temperature, absorbing and emitting radiation at an average power of 120 W. During a test, the radiation reaching the housing is increased to a new constant level. Over the first 25 s of the test, the internal energy of the housing increases by 750 J and its average emitted power is 150 W. Only radiation transfers energy to or from the housing.
By what percentage does the absorbed power increase during the test?
50%50\%50%
150%150\%150%
25%25\%25%
33%33\%33%
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.