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Which outcome affects current conduction when donor impurities enter a semiconductor crystal lattice?

A)Fermi level shifts toward conduction band
B)Band gap energy increases significantly
C)Electron-phonon coupling becomes stronger
D)Electron effective mass approaches infinity

💡 Explanation

Conduction increases because doping introduces excess electrons, and the Fermi level shifts toward the conduction band due to increased electron concentration. Therefore, more electrons are available for conduction, rather than increased band gap energies obstructing electron transition.

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