The Tungsten Filament of a Light Bulb Has an Operating

question 74

Multiple Choice

The tungsten filament of a light bulb has an operating temperature of about 2 100 K.If the emitting area of the filament is 1.0 cm²,and its emissivity is 0.68,what is the power output of the light bulb? (s = 5.67 ´ 10^-8 W/m²*K⁴)

• A)100 W
• B)75 W
• C)60 W
• D)40 W

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