The Tungsten Filament of a Light Bulb Has an Operating

Multiple Choice

The tungsten filament of a light bulb has an operating temperature of about 2 050 K.If the emitting area of the filament is 0.70 cm²,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−⁸ W/m²⋅K⁴)

A) 70.1 W
B) 47.7 W
C) 477 W
D) 42.7 W
E) 39.7 W