AQA · Physics · 8463
GCSE Physics: Emission and absorption of infrared radiation
Waves · AQA GCSE Physics (8463), specification point 4.6.3.1. Cards are generated from the exam board's own specification for "Emission and absorption of infrared radiation", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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Which bodies emit and absorb infrared radiation?
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All bodies, no matter what their temperature.
How does a body's temperature affect the infrared radiation it emits?
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The hotter the body, the more infrared radiation it radiates in a given time.
All bodies, whatever their temperature, emit and absorb ? radiation.
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infrared
What is a perfect black body?
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An object that absorbs all of the radiation incident on it.
How much radiation does a black body reflect or transmit?
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None — a black body does not reflect or transmit any radiation.
Why is a perfect black body the best possible emitter of radiation?
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Because a good absorber is also a good emitter, and a black body absorbs all radiation incident on it.
A perfect black body absorbs ? of the radiation incident on it.
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all
A good absorber of radiation is also a good what?
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A good emitter.
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