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Which outcome occurs when an electron’s wave function extends beyond the metal’s surface?

A)Thermionic emission is then increased
B)Quantum tunneling becomes more probable
C)Capacitance of junction decreases quickly
D)Band gap energy will significantly widen

💡 Explanation

Quantum tunneling becomes probable because the electron's wave function overlaps a potential barrier; therefore, tunneling occurs more readily because the electron has a non-zero probability of passing through rather than being completely reflected.

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