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18-01-2024
Mathematics

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The filament of a 75 W light bulb is at a temperature of 3,400 K. Assuming the filament has an emissivity e = 0.6, find its surface area in m².

a) 8.44 x 10⁻5 m²
b) 9.71 x 10⁻5 m²
c) 7.22 x 10⁻5 m²
d) 1.05 x 10⁻4 m²

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