The Tungsten Filament of a Light Bulb Has an Operating

question 67

Multiple Choice

The tungsten filament of a light bulb has an operating temperature of about 2,060 K.If the emitting area of the filament is 0.8 cm²,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−⁸ W/m²⋅K⁴)
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• A) 82 W
• B) 56 W
• C) 555 W
• D) 51 W
• E) ​48 W

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