Discussion
Which law states, "Signifies that good absorbers are good emitters".
Answer: C
This is Kirchhoff's law of thermal radiation.
At a given temperature and wavelength, the emissivity of a surface equals its absorptivity, so a good absorber must be a good emitter. It is why a matt black surface both absorbs and radiates most strongly, and why a perfect absorber - a black body - is also the perfect emitter.
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