The operating temperature of a tungsten filament in an incandescent lamp is 2000 K and its emissivity is 0.3. Find the surface area of the filament of a25 watt lamp. Stefen's constant σ=5.67 × 10 8 W m 2 K 4A. 0.412 × 10 5 m 2В. 0.918 × 10 4 m 2С. 0.212 × 10 4 m 2D. 0.416 × 10 4 m 2
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