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GCSE Physics · key term
An ideal object that absorbs all radiation incident on it, reflecting and transmitting none.
Used by AQA
Specification 4.6.3.1 · Paper 2
Revise: Emission and absorption of infrared radiationA perfect black body is the limiting case: it absorbs all the radiation incident on it. It reflects no radiation and transmits no radiation. “Perfect black body” describes this ideal radiation behaviour; it is not merely another name for an everyday object that looks black in visible light.
For a perfect black body, state all three outcomes: it absorbs all incident radiation, reflects none and transmits none.
Do not suggest that a perfect black body only absorbs radiation: a good absorber is also a good emitter, so it is the best possible emitter.
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