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(C) perfectly black body is an ideal absorber and emitter of radiation. According to Kirchhoff's law of radiation,the ratio of emissive power to absor

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It will not be distinguishable from the surroundings.

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(C) perfectly black body is an ideal absorber and emitter of radiation. According to Kirchhoff's law of radiation,the ratio of emissive power to absorptive power for any body is equal to the emissive power of a perfectly black body at the same temperature. When a black body is placed in an enclosure at the same temperature,it reaches thermal equilibrium with the surroundings. At thermal equilibrium,the rate of energy absorbed by the black body is equal to the rate of energy emitted by it. Consequently,the black body becomes indistinguishable from the surroundings because the intensity of radiation emitted by the body matches the intensity of radiation emitted by the walls of the enclosure.

$A$ perfectly black body is placed in an enclosure (furnace) at room temperature. Then:

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