1.

The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2. then the power it radiates at `1727^(@)C` is [`sigma=5.67xx10^(-8)` SI units]A. 11.4 WB. 1140 WC. 114 WD. `1.4xx10^(5)W`

Answer» Correct Answer - A
`P=sigmaArT^(4)`


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