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एक गोलिये पिण्ड जिसका क्षेत्रफल A तथा उत्सर्जकता`e=0।6` है,ताप T पर सम्पोषित एक कृष्णिका के भीतर रखा है।पिण्ड द्वारा विकरित ऊर्जा की दर है:
A. ` 0.4sigmaAT^(4)`
B. ` 0.6sigmaAT^(4)`
C. ` 0.8sigmaAT^(4)`
D. ` 1.0sigmaAT^(4)`

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Correct Answer - b
क्षेत्रफल A तथा ताप T के कृष्णिका पिण्ड द्वारा विकरित ऊर्जा की दर `(dQ)/(dt) =sigma T^(4)xxexxA` है।

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