The filament of a light bulb has a temperature of 2.80 103 °C and radiates 70 watts of power. The emissivity?
The filament of a light bulb has a temperature of 2.80 103 °C and radiates 70 watts of power. The emissivity of the filament is 0.35. Find the surface area of the filament.
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I = σET^4 = 1770177.3 w/m^2, where Stefan constant σ = 5.67040E-8 w/m^2-K^4
A = P/I = 70/1770177.3 = 3.9544061E-5 m^2 = 39.544061 mm^2
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