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

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unity.

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

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

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