24. A small-blackened solid copper sphere of radius 2.5 cm is placed in anevacuated chamber. The temperature ofthe chamber is maintained at 100 °C. Atwhat rate energy must be supplied to thecopper sphere to maintain its temperatureat 110 °C? (Take Stefan's constant o tobe 5.76 x 10-8 J sm2 K-4 and treat thesphere as blackbody.)[Ans: 0.962 W

24. A small-blackened solid copper sphere of radius 2.5 cm is placed

1.	24. A small-blackened solid copper sphere of radius 2.5 cm is placed in anevacuated chamber. The temperature ofthe chamber is maintained at 100 °C. Atwhat rate energy must be supplied to thecopper sphere to maintain its temperatureat 110 °C? (Take Stefan's constant o tobe 5.76 x 10-8 J sm2 K-4 and treat thesphere as blackbody.)[Ans: 0.962 W
Answer» 0.9645 WExplanation:

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