1.

An incandescent light bulb has a tungsten filament that is heated to a temperatur'e 3 xx 10^(3)K when an electric current passes through it. If the surface area of the filament is approximately 10^(-4) m^(2) and it has an emissivity of 0.32, the power radiated by the bulb is

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150 W
175 W
200 W
225 W

ANSWER :A


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