The table gives the intensity of the radiation emitted by two objects, P and Q, at three different wavelengths.
Table: Intensity of the radiation emitted by two objects at three wavelengths
| Wavelength in μm\mu\text{m}μm | Intensity from P in arbitrary units | Intensity from Q in arbitrary units |
|---|---|---|
| 2 | 4 | 95 |
| 6 | 30 | 60 |
| 14 | 12 | 18 |
Which conclusion is supported by these data?
P and Q are at the same temperature, because both emit at all wavelengths.
Q is cooler than P, because Q emits less radiation at 14 μm14\ \mu\text{m}14 μm than at 2 μm2\ \mu\text{m}2 μm.
Q is hotter than P, because Q emits more radiation at every wavelength.
P is hotter than Q, because P emits most strongly at a longer wavelength.
40 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.