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Which mechanism limits electron mobility in impure crystal semiconductors?

A)Phonon scattering reduces carrier velocity
B)Umklapp scattering in Brillouin zones
C)Impurity scattering changes electron trajectories
D)Intervalley scattering lowers effective mobility

💡 Explanation

Impurity scattering limits electrons because lattice defects impede motion changing carrier trajectories; therefore, mobility decreases rather than phonon scattering or Umklapp processes, which are intrinsic to perfect crystal lattice vibration.

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