A rescue team tests two identical reusable heat packs, R and S. Both packs are heated to the same temperature, above room temperature, and placed side by side in the same cooler room. The outer surface of pack R behaves like a perfect black body, while the outer surface of pack S is polished metal. Which pack has the greater decrease in temperature during the first minute due to infrared radiation, and why?
pack S, because a perfect black body only absorbs radiation and does not emit it
pack R, because a perfect black body is the best possible emitter
neither pack, because objects at the same temperature emit infrared at the same rate
pack R, because a perfect black body reflects all the radiation falling on it
106 exam-style questions on AQA GCSE Physics 6.3 Black body radiation, covering 6.3.1 Emission and absorption of infrared radiation and 6.3.2 Perfect black bodies and radiation. Each one has a worked solution and a mark scheme showing where the marks go.