A 100W bulb has tungsten filament of total length 1.0m and radius 4 x 10^-5m.
A 100W bulb has tungsten filament of total length 1.0m and radius 4 x 10-5m. The emissivity of the filament is 0.8 and σ = 6.0 x 10-8W/m2-K4. Calculate the temperature of the filament when the bulb is operating at correct wattage.
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Q/t = AeσT4
=> T4 = θ/teAσ => 100/(0.8 x 2 x 3.14 x 4 x 10-5 x 1 x 6 x 10-8)
=> T = 1697.0 ≈ 1700K
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