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Which outcome occurs when impurities raise the Fermi level?

A)Increased free electron concentration results
B)Decreased intrinsic carrier concentration occurs
C)Reduced electron-hole recombination happens
D)Enhanced crystal lattice phonon scattering

💡 Explanation

N-type doping with impurities causes more electrons, therefore raising the Fermi level near the conduction band. This increases free electron concentration because the gap between the Fermi level and the conduction band edge decreases; rather than decreasing other transport band effects.

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