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Which outcome occurs when the iron core formation ends fusion reactions in a collapsing massive star?

A)Decreased outward radiation pressure results
B)Increased rate of beta-minus decay occurs
C)Quantum tunneling probability decreases
D)Stronger electromagnetic force emerges

💡 Explanation

Decreased outward radiation pressure occurs because iron fusion requires energy, rather than releasing it, which removes a critical pressure supporting the star through radiative transfer. Gravity overwhelms, causing core collapse, rather than stability observed with lighter elements.

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