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← ScienceWhich outcome sharply increases when high-energy neutrons bombard Uranium-235 isotopes?
A)Sustained nuclear fission reaction✓
B)Spontaneous alpha decay rate
C)Increased Uranium-238 concentration
D)Decreased neutron absorption cross-section
💡 Explanation
A sustained fission reaction ensues because neutron absorption by U-235 causes nuclear instability, initiating nuclear fission, therefore more neutrons are released propagating additional fissions, rather than simply undergoing decay or modifying isotopic abundances; this is a chain reaction.
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