Question

Under which condition does a black body emit radiation

Answer 1

Ignoring the atmosphere and greenhouse effect, the planet, since it is at a much lower temperature than the Sun, emits mostly in the infrared (IR) portion of the spectrum. In this frequency range, it emits of the radiation that a black body would emit where is the average emissivity in the IR range.

Answer 2

a black body is thermal equilibrium emits electromagnetic radiation called black body radiation.
the radiation is emitted according to Planck's law meaning that it has a spectrum that is determined by the temperature alone



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