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← ScienceWhich outcome results as crystalline silicon purity increases to achieve intrinsic behavior?
A)Increased electron-hole recombination rate
B)Reduced thermal conductivity dominates
C)Decreased resistivity controls conduction✓
D)Increased effective mass impairs mobility
💡 Explanation
Decreased resistivity occurs because reduced lattice defects means decreased electron scattering during drift; this increases mobility. Therefor, resistivity decreases rather than increases when purity increases, despite a reduction only in carrier density, not thermal behavior directly.
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