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← ScienceWhich outcome arises from exceeding the optimal *binding energy* in a star's iron core?
A)Rapid core collapse ensues.✓
B)Hydrogen fusion accelerates steadily.
C)Increased convective heat transfer.
D)The radiative zone expands notably.
💡 Explanation
Rapid core collapse proceeds because surpassing the iron core's *binding energy* threshold activates *photodisintegration*, breaking down nuclei into lighter particles; therefore gravitational pressure overwhelms outward forces internally, rather than sustaining hydrostatic equilibrium or enhancing other energy transport.
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