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← ScienceWhich 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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