Radiation: 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

Question

Quizplus · Accepted Answer

The Answer of Radiation: 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

Radiation: the Filament in a Light Bulb Has a Diameter