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← ScienceWhich mechanism causes increased resistance when a crystal of gallium arsenide is subjected to intense strain?
A)Piezoelectric field generation
B)Band gap energy reduction
C)Impurity band delocalization
D)Phonon scattering increase✓
💡 Explanation
Increased strain raises the density of crystal defects, promoting phonon scattering; this impedes electron flow and increases resistance, because electrons collide more frequently with vibrating lattice atoms. Therefore, resistance rises due to phonon scattering rather than direct band gap changes.
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