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4. When does a surface have its total hemispherical emissivity equal to its total hemispherical absorptivity...

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Mechanical Engineering

4. When does a surface have its total hemispherical emissivityequal to its total hemispherical absorptivity for radiation comingfrom a blackbody?

A. When the surface temperature is equal to the temperature ofthe source of radiation

B. When the surface temperature is greater than the temperatureof the source of radiation

C. When the surface temperature is less than the temperature ofthe source of radiation

D. When the surface temperature and the temperature of thesource of radiation are equal to absolute zero

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