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← ScienceWhich conduction consequence results when grain boundaries impede phonon propagation?
A)Reduced thermal conductivity occurs✓
B)Increased electrical conductivity occurs
C)Enhanced piezoelectric effect results
D)Photovoltaic efficiency increases rapidly
💡 Explanation
Reduced thermal conductivity results from Umklapp scattering increasing because localized defects disrupts long-range order, diminishing the phonon mean free path; therefore, thermal conductivity is reduced, rather than enhanced conductivity, which would require coherent electron motion.
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