An Electric Current Through a Tungsten Filament Maintains Its Temperature

question 1

Multiple Choice

An electric current through a tungsten filament maintains its temperature at 2800 K.Assume the tungsten filament behaves as an ideal radiator at that temperature.If the radiating area of the filament is 2.0 × 10^-6 m²,at what rate does it radiate energy? (σ = 5.670 × 10^-8 W/m² ∙ K⁴,Wien displacement law constant is 2.90 × 10^-3 m ∙ K)

• A)5.5 W
• B)7.0 W
• C)8.5 W
• D)10 W
• E)11.5 W

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