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← ScienceWhich outcome results when a piezoelectric crystal is mechanically stressed?
A)Voltage difference across crystal faces✓
B)Crystal structure phase transition occurs
C)Acoustic emission from sudden fracture
D)Increase in the crystal resonant frequency
💡 Explanation
A voltage difference arises because mechanical stress induces **charge separation** within the crystal lattice; therefore a voltage appears rather than phase transition or crystal fracture because the stress is significantly below material limits.
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