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← ScienceWhich outcome occurs when stellar nucleosynthesis plateaus at iron?
A)Binding energy inhibits further fusion✓
B)Gravitational collapse immediately initiates
C)Abundant free neutron production begins
D)Radiation pressure overcomes gravity alone
💡 Explanation
Fusion reactions stop for heavier elements because the binding energy per nucleon decreases in iron. Additional fusion is endothermic rather than exothermic; therefore, it reduces overall energy rather than releasing energy and supporting the star.
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