What does the Kirchoffs identity state? - Heat Transfer

Q.  What does the Kirchoff's identity state?
- Published on 11 Aug 15

a. the emissivity and the absorptivity of the black body are same and always less than 1
b. the emissivity and the absorptivity of the black body are same and always more than 1
c. the emissivity and the absorptivity of the black body are same and always equal to 1
d. none of the above

ANSWER: the emissivity and the absorptivity of the black body are same and always equal to 1

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