Heat TransferMedium
Question
Three objects colored black, gray and white can withstand hostile conditions upto2800oC. These objects are thrown into a furnce where each of them attains a temperature of 2000oC. Which object will glow brightest ?
Options
A.the white object
B.the black object
C.all glow with equal brightness
D.gray object
Solution
Black has greatest emissivity and greatest absorbity as compared with colours. At2000oC .it will have greatest emissivity so it will glow brightest.
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