The tungsten filament of an electric lamp has a length of `0.5m` and a diameter `6xx10^(-5)m`. The
Channel: Doubtnut
Date: 12/04/2020

The tungsten filament of an electric lamp has a length of `0.5m` and a diameter `6xx10^(-5)m`. The power rating of the lamp is `60 W`. Assuming the radiation from the filament is equivalent to `80 %` that of a perfect black body radiator at the same temperature, estimate the steady temperature of the filament.(Stefan constant `=5.7xx10^(-8)Wm^(-2)K^(-4)`)