The operating temperature of a tungsten filament in an incandescent light bulb is 2500 KK, and its emissivity is 0.350. Find the surface area of the filament of a 200 WW bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves. (Only a fraction of the radiation appears as visible light.)

The operating temperature of a tungsten filament in an incandescent light bulb is 2500 KK, and its emissivity is 0.350. Find the surface area of the filament of a 200 WW bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves. (Only a fraction of the radiation appears as visible light.)