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Which effect will appear when applying enough voltage difference for impact ionization to occur in a semiconductor diode?

A)Avalanche breakdown occurs causing high current
B)Zener tunneling dominates, limiting current
C)Thermal runaway reduces conductivity
D)Capacitance increases due to charge accumulation

💡 Explanation

When sufficient voltage enables impact ionization, electrons gain enough energy to knock other electrons loose, leading to avalanche breakdown because each freed electron can trigger further ionizations and producing high current. Therefore, avalanche breakdown results, rather than Zener tunneling, thermal runaway, or increased capacitance which require other junction properties.

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