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Which outcome occurs when impurities narrow band gaps?

A)Increased electrical conductivity at junctions
B)Enhanced thermal conductivity occurs overall
C)Increased structural tensile strength results
D)Reduced resistance to fatigue cracking forms

💡 Explanation

Increased electrical conductivity occurs because doping via impurities decreases the band gap and increases charge carrier density, which lowers resistance; therefore current flow increases, rather than strength increases, because the mechanism changes carrier population, not mechanical interaction.

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