If a black body emits 0.5 joules of energy per second when it is at 27^ C, then the amount of energy emitted by it when it is at 627^ C will be

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Accepted Answer

Correct answer: C. (c) The energy emitted by a black body per second is given by Stefan's law E= T^4. ∴ E^ 'E= (273+627 )^4 (273+27 )^4= (900 K )^4 (300 K )^4 ⇒E^ '=0.5 (900 )^4 (300 )^4=0.5 81=40.5 J.

$If a black body emits 0.5 joules of energy per second when it is at 27^{\circ} C, then the amount of energy emitted by it when it is at 627^{\circ} C will be$

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