Discussion
A blackbody or Planckian radiator is
Answer: A
Correct answer: an idealised body whose emission depends only on its temperature
A blackbody absorbs all radiation falling on it and re-emits according to Planck’s law, so its whole spectrum is fixed by a single number, its temperature. That is what makes it a useful reference: any thermal source can be described by the blackbody temperature it most nearly resembles.
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