1.

A 100 W light bulb has a tungsten filament (emissivity = 0.30) which is required to operate at 2780 K. If the bulb is completely evacuated, calculate the minimum surface area of the tungsten filament

A. 0.98 * 10¯⁴ m²
B. 1.98 * 10¯⁴ m²
C. 2.98 * 10¯⁴ m²
D. 3.98 * 10¯⁴ m²
Answer» B. 1.98 * 10¯⁴ m²


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