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Last Updated on 01/25/2023 by Sophia

A radiant heat lamp is a rod, 0.5 m long, 0.5 cm in diameter, through which 400 W of electric energy is deposited. Assume the surface emissivity to be 0.9 and neglecting incoming radiation, find the rod surface temperature? a) 700K b) 800K c) 900K d) 1000K