A perfect black body is a

perfect absorber of radiations.

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perfect emitter of radiations.

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perfect reflector of radiations.

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perfect refractor or radiations.

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Solution

The correct options are
A perfect absorber of radiations.
B perfect emitter of radiations.
A body which absorbs all the radiation incident on it is known as a perfectly black body a good absorber is always a good emitter of radiation hands perfectly black bodies are always good emitters of radiation

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A black body is a perfect absorber and a perfect emitter of radiation.

A black body is a perfect absorber and perfect emitter of radiation.

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