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
Correct Answer:
Verified
Correct Answer:
Verified
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