Question: A radiation thermometer is a radiometer calibrated to indicate the temperature of a blackbody. A steel billet having a diffuse gray surface of emissivity 0.8

A radiation thermometer is a radiometer calibrated to indicate the temperature of a blackbody. A steel billet having a diffuse gray surface of emissivity 0.8 is heated in a furnace whose walls are at 1500 K. Estimate the temperature of the billet when the radiation thermometer viewing the billet through a small hole in the furnace indicates 1160 K.

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