Two identical solar water-heating panels are at the same temperature in the same room. One has a matt black surface and the other has a white surface.
Which statement correctly compares the infrared radiation emitted by the panels each second?
Both surfaces emit the same amount of infrared radiation because they are at the same temperature.
The matt black surface emits less infrared radiation because it absorbs more infrared radiation from the room.
The matt black surface emits more infrared radiation because a good absorber is also a good emitter.
The white surface emits more infrared radiation because it reflects more infrared radiation.
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.