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← ScienceWhich outcome results when specific impurities bridge band gaps?
A)Increased electrical conductivity occurs✓
B)Reduced thermal expansion results
C)Enhanced optical reflectivity occurs
D)Giant magnetoresistance diminishes completely
💡 Explanation
Increased electrical conductivity results from extrinsic semiconduction because impurity atoms introduce energy levels within the band gap, allowing electrons to jump to the conduction band; therefore, conductivity rises rather than other optical or thermal effects.
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