The Filament in a Light Bulb Has a Diameter of 0.050

question 31

Multiple Choice

The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0. The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power? The Stefan-Boltzmann constant is 5.67 x 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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