An Excited U* Nucleus Undergoes Fission into Two Fragments

question 21

Multiple Choice

An excited U* nucleus undergoes fission into two fragments, as shown:
U* → Ba + Kr
The following atomic masses are known:
Kr: 91.926270 u
Ba: 143.922845 u U*: 236.045563 u
What is the reaction energy, in MeV, for this process? (1 u = 1.6605 × 10^-27 kg = 931.5 MeV/c²)

• A) 150 MeV
• B) 160 MeV
• C) 170 MeV
• D) 180 MeV
• E) 190 MeV

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