Two identical ceramic slabs are heated to the same temperature and placed in the same room, which is cooler than the slabs. Slab P has a surface that is a better absorber of infrared radiation than the surface of slab Q. After the same length of time, which slab has the lower temperature, and why?
slab P, because absorbing infrared from the room makes slab P lose energy at a greater rate
neither slab, because slabs at the same starting temperature emit infrared at the same rate
slab P, because a good absorber is also a good emitter, so slab P loses energy at a greater rate
slab Q, because a poor absorber is a good emitter, so slab Q loses energy at a greater rate
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.