An Excited U* Nucleus Undergoes Fission into Two Fragments

question 62

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
Assume, at a given instant, that the two fission fragments are spherical, just barely in contact, and carry spherically symmetric charge distributions. At that instant, what is the electrostatic interaction energy of the two fragments, in MeV? (1 u = 1.6605 × 10^-27 kg = 931.5 MeV/c², 1/4πε0 = 9.0 × 10⁹ N * m²/C²)

• A) 230 MeV
• B) 240 MeV
• C) 250 MeV
• D) 260 MeV
• E) 270 MeV

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