A 100 W light bulb has a tungsten filament (emissivity = 0.30) which is required

Question

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

Options:

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: Option A
Answer: (a).0.98 * 10¯⁴ m²

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