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18 A tungsten lamp at a temperature of 3000 K has surface area of 0...

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18 A tungsten lamp at a temperature of 3000 K has surface area of 0 3 cm If the lamp has emissivity of 0 4 the rate of heat radiated is NCERT Pg 295 1 40 W 3 90 W 2 50 W 4 55 W

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