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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 |
दर्शाइए कि `""_(92)^(238)"U"` स्वत: प्रोटॉन उत्सर्जित नहीं कर सकता |

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Best answer
`""_(92)^(238)"U"to""_(91)^(237)" Pa"+""_(1)^(1)"H"+Q`
अत: ऊर्जा Q
`=[m(""_(92)^(238)"U")-m(""_(91)^(237)"Pa")-m(""_(1)^(1)"H")]c^(2)`
`=(238.05079-234.04363-1.00783)u xx c^(2)`
`= -0.00825" u"xx c^(2)`
`= -0.00825xx931.5("MeV")/(c^(2))xx c^(2)`
`=-7.68" MeV."`
यहाँ Q ऋणात्मक है | अत: `""_(92)^(238)"U"` स्वत: प्रोटॉन उत्सर्जित नहीं कर सकता |

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