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

4. When does a surface have its total hemispherical emissivity equal to its total hemispherical absorptivity for radiation coming from a blackbody?

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

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

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

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

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