A reusable gel pack is warmed and then allowed to cool. In a thermal image taken immediately after warming, the pack appears pale orange. In a second thermal image taken 10 minutes later, the pack appears dark violet.
What change in the radiation from the pack is shown by the second thermal image?
The peak wavelength of the radiation from the pack becomes shorter.
The pack transfers less energy each second by infrared radiation.
The pack absorbs all of the radiation incident on its surface.
The pack begins to emit visible violet light as it cools.
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.