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Which 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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