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(C) perfectly black body is defined as an ideal body that absorbs all incident radiation of any wavelength. According to Kirchhoff's law of thermal ra

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unity

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(C) perfectly black body is defined as an ideal body that absorbs all incident radiation of any wavelength. According to Kirchhoff's law of thermal radiation,for an arbitrary body in thermal equilibrium,the emissivity $(e)$ is equal to its absorptivity $(a)$. Since a perfectly black body has an absorptivity of $a = 1$,its emissivity must also be $e = 1$. Therefore,the coefficient of emission for a perfectly black body is unity.

For a perfectly black body,the coefficient of emission (emissivity) is:

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