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Which mechanism destabilizes a crystal lattice during rapid heating?

A)Increased phonon mode population
B)Decreased electron-phonon scattering
C)Reduced point defect migration
D)Enhanced umklapp scattering events

💡 Explanation

Increased phonon mode population destabilizes the lattice because excited atoms vibrate more intensely at different frequencies, therefore thermal expansion increases, ultimately inducing phase transitions or melting, rather than remaining stable or collapsing because of lower vibrational excitation.

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