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Emissivity of perfectly black body is (a) 1 (b) 2 (c) 5 (d) 0

Emissivity of perfectly black body is
(a) 1
(b) 2
(c) 5
(d) 0

Grade:Upto college level

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

The answer is option a

Regards
Vikas TU
14149 Points
one year ago
ε = 1
Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity of ε = 1. A source with lower emissivity independent of frequency often is referred to as a gray body.

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