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← ScienceWhich consequence results when impurities disrupt the phonon dispersion?
A)Decreased thermal conductivity✓
B)Increased electrical resistivity
C)Enhanced optical transparency
D)Reduced magnetic susceptibility
💡 Explanation
Decreased thermal conductivity occurs due to phonon scattering. Introduction of impurities modifies the material, enhancing phonon scattering because the impurities disrupt the periodicity associated with lattice vibrations, therefore reducing the mean free path rather than allowing free unimpeded transmission.
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