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the filament of a typical incandescent lightbulb is at a temperature of 3000k for a 100w lightbulb. what is the surface area (mm2) of the

the filament of a typical incandescent lightbulb is at a temperature of 3000k for a 100w lightbulb. what is the surface area (mm2) of the filament, assume the entire 100w goes into radiantly heating the filament is 95% the other 5% goes into producing light and the filament has an emissivity of one

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