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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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