good absorbers are good emitters. why?
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According to Kirchhoff's Law of Thermal Radiation: the coefficient of emission of a body is equal to its coefficient of absorption. This implies that the amount of heat absorbed, and heat radiated by a body are always equal. ... Which means that the good absorbers of heat are also good emitters of heat.
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Therefore in order to keep it's temperature equal to room temperature it emits more radiation. Therefore if a body absorb more radiation the it have emit more. That's why good absorbers are also good emitters. Others have given good answers, so I'll just add flavor...
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