For a perfectly black body,its absorptive pow | vedclass

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(A) perfectly black body is defined as an object that absorbs all the electromagnetic radiation incident upon it,regardless of frequency or angle of i

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$1$

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(A) perfectly black body is defined as an object that absorbs all the electromagnetic radiation incident upon it,regardless of frequency or angle of incidence.By definition,the absorptive power $(a)$ of a body is the ratio of the energy absorbed to the total energy incident on it.Since a perfectly black body absorbs all incident radiation,the energy absorbed equals the total energy incident.Therefore,its absorptive power is $a = 1$.

For a perfectly black body,its absorptive power is

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