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[" Q.20) A black body of emissive "],[" ...

[" Q.20) A black body of emissive "],[" power "81J/m^(2)s" when it is at "300],[k" and ordinary body of "],[" emissivity "0.8" when it is at "500k],[" What is emissive power of "],[" ordinary body "^(***)],[" ( "500J/m^(2)s],[" O "600J/m^(2)s],[" ( "800J/m^(2)s],[" O "400J/m^(2)s]

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