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The tungsten filament of an electric lamp has a length of 0.5 m and a diameter 6×10−5 m. The power rating of the lamp is 60 W. Assuming the radiation from the filament is equivalent to 80% of a perfect black body radiator at the same temperature, estimate the steady state temperature of the filament (Stefan's constant =5.7×10−8 W m−2K−4) |
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Answer» The tungsten filament of an electric lamp has a length of 0.5 m and a diameter 6×10−5 m. The power rating of the lamp is 60 W. Assuming the radiation from the filament is equivalent to 80% of a perfect black body radiator at the same temperature, estimate the steady state temperature of the filament (Stefan's constant =5.7×10−8 W m−2K−4) |
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