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Home Q & A Board Science-Related Homework Help Physics
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ikhan ikhan
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11 years ago
When a uranium nucleus at rest breaks apart in the process known as fission in a nuclear reactor, the resulting fragments have a total kinetic energy of about 205 MeV. How much mass was lost in the process?
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judd872judd872
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11 years ago
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11 years ago
assuming from your question that all of the loss of mass was converted to KE of the fission fragements,
one atomic mass unit (amu) equals 931.46 Mev
so ...... 205MeV/931.46MeV/amu = 0.220084598 amu
1 amu = 1.66E-27Kg

 so 1.66E-27Kg/amu *  0.220084598 amu = 3.65459E-28Kg

usually, the KE of the fission fragments accounts for 85% of the total energy released in fission of U235
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