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[" The energy emitted per second by a bl...

[" The energy emitted per second by a black body at "],[27^(@)C" is "10J" .If temperature of the black body is "],[" increased to "327^(@)C" ,the energy emitted per second "],[" will be "],[[" (1) "20J," (2) "40J],[" (3) "80J," (4) "160J]]

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