alleryStart learning →How is the emissivity of a surface defined?
AIts emissive power over blackbody emissive power
BIts mass divided by its surface area
CAbsorbed energy over transmitted energy
DIts area multiplied by temperature
Answer & Solution
Correct answer: A. Its emissive power over blackbody emissive power
Emissivity e equals R divided by RB, comparing the surface with a perfect blackbody at the same temperature.
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