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6.3 Black body radiation

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Question 32

A manufacturer uses an infrared oven to heat metal moulds. The moulds need to warm rapidly in the oven and then cool slowly after they are removed.

Two identical moulds have different surface coatings, P and Q. The same amount of infrared radiation falls on each mould. The moulds start at the same temperature.

CoatingEnergy absorbed in 30 s in J
P450
Q180

While the moulds are in the oven, the energy they emit is much less than the energy they absorb. After removal, the moulds start at the same temperature and the energy they absorb from the room is much less than the energy they emit.

Evaluate whether coating P or coating Q is better for the moulds.

[4]
Markscheme

6.3 Black body radiation Questions

  1. GCSE
  2. /Physics
  3. /6.3 Black body 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.

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