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← ScienceWhich mechanism suppresses conductivity in intrinsic semiconductors as temperature decreases?
A)Increased electron-hole recombination probability
B)Reduced thermal electron excitation✓
C)Increased scattering from lattice vibrations
D)Widening semiconductor impurity energy bands
💡 Explanation
The *reduction in thermal electron excitation* across the band gap causes decreased conductivity because fewer electrons gain sufficient energy to transition into the conduction band. Therefore, conductivity decreases rather than increasing scattering impeding movement at higher temperatures.
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