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एक आदर्श कृष्णिका का ताप `1727^(@)C` तथा क्षेत्रफल `0.1" मीटर"^(2)` है | कृष्णिका द्वारा प्रति मिनट उत्सर्जित विकिरण ऊर्जा की गणना कीजिये | स्टीफन नियतांक, `sigma=5.67xx10^(-8)" वाट/मीटर"^(2)-K^(4)` |

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आदर्श कृष्णिका से विकिरित ऊर्जा,
`E=Pt=A sigma T^(4)t`
प्रश्नानुसार, `A=0.1" मीटर"^(2), sigma=5.67xx10^(-8)" वाट/मीटर"^(2)-K^(4)`
`T=1727+273=200 K, t=1` मिनट =60 सेकण्ड
`therefore" "E=(0.1)xx(5.67xx10^(-8))xx(2000)^(4)xx(60)`
`=5.44xx10^(4)` जूल

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