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-7. The temperature of the filament of a lamp is2100K and its surface area is 4 x104m. If theemissivity of the filament is 0.453 then the powerof lamp is(1) 100 Watt(2) 200 Watt(3) 400 Watt(4) 0 Watt |
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Answer» Answer: 2 Explanation: |
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