Three identical ceramic covers for outdoor sensors are tested in a temperature-controlled chamber. The energy emitted as infrared radiation from the same area of each cover is measured over 5.0 s.
| Cover | Temperature in ∘C^\circ\text{C}∘C | Energy emitted as infrared radiation in J\text{J}J |
|---|---|---|
| P | -20 | 11 |
| Q | 15 | 18 |
| R | 50 | 28 |
A student claims that cover P does not emit infrared radiation because its temperature is below 0 ∘C0\ ^\circ\text{C}0 ∘C.
Explain, using the results, why the student's claim is incorrect.
Cover Q is heated to 35 ∘C35\ ^\circ\text{C}35 ∘C. Give the range in which the energy it emits as infrared radiation over 5.0 s is expected to lie. Explain your answer.
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.