During an observation lasting 2.0 min, a remote sensing unit on a satellite emits 43.2 kJ of energy while its temperature stays constant. Incoming radiation reaches the unit at an average rate of 600 W. Some of this radiation is reflected and the rest is absorbed. The unit transfers energy only by radiation.
What percentage of the radiation received by the unit is reflected?
60%60\%60%
28%28\%28%
67%67\%67%
40%40\%40%
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.