For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then itsradiating power will be :

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304 W

320 W

240 W

120 W

answer is B.

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Detailed Solution

∵P∞(T4-T04) ∴ P2P1=15004-500410004-5004=5004(34-1)5004(24-1)=8015.

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