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← ScienceWhich 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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