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Which consequence results when impurity doping induces band gap narrowing in a semiconductor?

A)Increased conductivity near the junction
B)Decreased electron-hole recombination rate
C)Enhanced piezoelectric charge generation
D)Reduced thermal expansion coefficient

💡 Explanation

Band gap narrowing causes increased carrier concentration available for conduction because the dopant energy levels merge with the conduction or valence bands, therefore conductivity is boosted near the junction, rather than inhibiting carrier flow or affecting material properties like thermal expansion.

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