A 100 W bulb has tungsten filament of length

Question:

A $100 \mathrm{~W}$ bulb has tungsten filament of length $1.0 \mathrm{~m}$ and radius $4 \times 10^{-5} \mathrm{~m}$. The emissivity of the filament is $0.8$ and $\sigma=6.0 \times 10^{-8} W / m^{2}-K^{4}$. Calculate the temperature of the filament when the bulb is operating at correct wattage.

Solution:

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