A light bulb filament is constructed from 2 cm of tungsten wire of diameter 50 pam and is enclosed in an evacuated glass bulb. What temperature does the filament reach when it is operated at a power of 1 W? (Assume the emissivity of the tungsten surface to be 0.4.)
A light bulb filament is constructed from 2 cm of tungsten wire of diameter 50 pam and is enclosed in an evacuated glass bulb. What temperature does the filament reach when it is operated at a power of 1 W? (Assume the emissivity of the tungsten surface to be 0.4.)
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Transcribed Image Text:A light bulb filament is constructed from 2 cm of tungsten wire of
diameter 50 pam and is enclosed in an evacuated glass bulb. What
temperature does the filament reach when it is operated at a power of
1 W? (Assume the emissivity of the tungsten surface to be 0.4.)
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