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← ScienceWhich mechanism causes spontaneous nuclear decay within unstable isotopes?
A)Quantum tunneling through potential barrier✓
B)Thermal activation overcoming binding energy
C)Increased neutron absorption cross-section
D)Chain reaction propagating alpha emission
💡 Explanation
Quantum tunneling allows the electron to escape the nucleus despite lacking sufficient energy to surmount the potential energy barrier, leading to decay; therefore, tunneling causes electron emission, rather than thermal activation triggering release.
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