Question

vi) For a perfect blackbody, Coefficient of emission e =
(A) 0 (B) 1 (C) 2 (D) 1.5

give me answer
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Answer 1

Answer:

A perfectly black body neither reflects nor transmit. (i.e. r = 0, t = 0 ) any part of the incident radiative energy but absorb whole of it or we can say its absorptive power is 1.

Explanation:

Answer 2

Following are the steps for getting the answer:

we have to find the Coefficient of emission e For a perfect blackbody

• The coefficient of emission of a body is the ratio of the emissive power of the body at a given temperature to the emissive power of a perfectly black body at the same temperature.
• The value of emissive power lies between 0 to 1.
• The emissive power of a perfectly black body is 1.

thus, the correct option is (B)1