Question:
show that good emmitters are good absorbers
Answer:
Materials which are good at emitting their thermal radiation are also good at absorbing incoming radiation.The process of absorbing an incoming photon is exactly the reverse of the process of emitting one, so if a material has lots of available transitions inside of it or transitions which are more strongly coupled to the electromagnetic field, then those transitions are available for both emission and absorption.
Eg. Black colour
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