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← ScienceWhich outcome occurs when a stable isotope absorbs radiative energy?
A)Increased internal energy/no phase transition
B)Immediate radioactive fission/no decay.
C)Binding exceeds threshold: decays/emits.✓
D)Spontaneous fusion/release energy in photons
💡 Explanation
Radioactive decay occurs because the binding energy is temporarily exceeded via energy input and quantum tunneling. This causes the excited nucleus to decay through particle emissions, rather than spontaneous fusion; therefore, the nucleus releases a particle.
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