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माना कि हम `""_(26)^(56)"Fe"` नाभिक के दो समान अवयवों `""_(13)^(28)"Al"` में विखंडन पर विचार करें | क्या ऊर्जा की दृष्टि से यह विखंडन संभव है ? प्रक्रम का Q - मान ज्ञात करके अपना तर्क प्रस्तुत करें |
दिया है - `m=(""_(26)^(56)"Fe")=55.93494" u"` एवं
`m(""_(13)^(28)"Al")=22.98191" u."`

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`""_(26)^(56)"Fe"to""_(13)^(28)"Al"+""_(13)^(28)"Al"`
`Q=[m(""_(26)^(56)"Fe")-m(""_(13)^(28)"Al")-m(""_(13)^(28)"Al")]c^(2)`
`=[55.93494-27.98191-27.98191]" uc"^(2)`
`=(55.93494-55.96382)xx931.5("MeV")/(c^(2))xx c^(2)`
`=-0.02888xx931.5=-26.90" MeV."`
ऊर्जा ऋणात्मक है, अत: विखंडन संभव नहीं है |

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