The emissivity for a black body is
A. 0
B. 0.5
C. 0.75
D. 1
Answer: Option D
Solution(By Examveda Team)
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.This Question Belongs to Mechanical Engineering >> Heat And Mass Transfer
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