Two identical paving slabs have different surface treatments, P and Q. Equal amounts of infrared radiation fall on the two surfaces during an absorption test.
| Surface | Energy absorbed in 20 seconds in J |
|---|---|
| P | 80 |
| Q | 25 |
The slabs are then brought to the same temperature.
Which statement about their emission of infrared radiation is correct?
Surface P emits infrared at the greater rate because a good absorber is also a good emitter.
Surface Q emits infrared at the greater rate because it absorbed less radiation in the test.
Both surfaces emit infrared at the same rate because the slabs are at the same temperature.
Neither surface emits infrared because the slabs are not hot enough to glow.
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.