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Question

Consider the fission reaction
92U236X117+Y117+0n1+0n1
ie., two nuclei of same mass number 117 are formed plus two neutrons. The binding energy per nucleon of X and Y is 8.5MeV where as of U236 is 7.6MeV. Find the total energy liberated.

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Solution

23692UK117+Y117+10n+1n+Q
Q: energy released
Binding energy 23692U=7.6×236=1793.6MeV
Binding energy per nuclear of K117=8.5×117=994.5
Binding energy per nucler of Y117=8.5MeV
Total binding energy Y117=8.5×117=994.5MeV
Substituting energy values in equation we get,
1793.6=994.5+994.5+Q
Q=()195.4MeV
As the Q-value is negative the fission is not energetically possible.


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