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Question

If between wavelength λ and λ+dλ,Eλ and aλ are the emissive and absorptive powers of a body and Ebλ is the emissive power of a perfectly black body, then according to Kirchhoff's law, which of the following is true?

A
Eλ=aλ=Ebλ
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B
EλEbλ=aλ
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C
Eλ=aλEbλ
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D
EλaλEbλ= constant
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