The Filament in a Light Bulb Has a Diameter of 0.050

question 18

Multiple Choice

The filament in a light bulb has a diameter of 0.050 mm and an emissivity of 1.0.The temperature of the filament is 3000°C.What should be the length of the filament so it will radiate 60 W of power? The Stefan-Boltzmann constant is 5.670 × 10^-8 W/m² · K⁴.

• A)11 cm
• B)9.4 cm
• C)8.6 cm
• D)7.2 cm
• E)5.9 cm

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