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Which outcome occurs when a crystalline semiconductor contains impurities?

A)Intermediate energy levels form mid-gap
B)Overall lattice symmetry gets more uniform
C)Phonon dispersion shifts to lower energy
D)The dielectric constant becomes smaller

💡 Explanation

Intermediate energy levels form within the band gap because dopant atoms introduce new electronic states; therefore the semiconductor’s conductivity changes, rather than phonon behavior due to altered dielectric properties.

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