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हमें निम्नलिखित परमाणु द्रव्यमान दिए गए हैं -
`""_(92)^(238)"U"=238.05079u,""_(2)^(4)"He"=4.00260" u"`,
`""_(90)^(234)"Th"=234.04363" u",""_(1)^(1)"H"=1.00783" u"`,
`""_(91)^(237)"Pa"=237.05121" u"`
जहाँ Pa तत्व प्रोटऐक्टिवियम (Z = 91) के लिए संकेत है |
`""_(92)^(238)"U"` के `alpha`-क्षय में उत्सर्जित ऊर्जा परिकलित कीजिए |

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`""_(92)^(238)"U"to""_(90)^(234)"Th"+""_(2)^(4)"He"+Q`
सूत्र - `E="mc"^(2)` के अनुसार उत्सर्जित ऊर्जा
`=[m(""_(92)^(238)"U")-m(""_(90)^(234)"Th")-m(""_(2)^(4)"He")]c^(2)`
`=(238.05079-237.05121-4.00260)u xx c^(2)`
`=0.00456" u"xx c^(2)`
`=0.00456" u"xx931.5("MeV")/(c^(2))xx c^(2)`
`=4.25" MeV."`

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