For 10 points, name this phenomenon in which mechanical stress causes the buildup of electric charge.
This phenomenon can be induced by heating a material above the Curie point, applying a large electric field, and then cooling it in the poling process. A converse version of this phenomenon, as predicted by Gabriel Lippman, was observed in cellulose and is also exploited in actuators. Paul Langevin used materials that exhibit this phenomenon to make an ultrasonic transducer for submarines. The (*) Curie brothers found Rochelle salt to exhibit a strong form of this phenomenon and used another material to develop an electrometer using this phenomenon. Modern crystal radio earpieces use materials that exhibit this phenomenon. Some clocks use quartz crystals as batteries since quartz exhibits this phenomenon. For 10 points, name this phenomenon in which mechanical stress causes the buildup of electric charge.
This phenomenon can be induced by heating a material above the Curie point, applying a large electric field, and then cooling it in the poling process.
piezoelectricity [or piezoelectric effect] &lt;JL, Phys&gt;