“…6,14,26,47 One of his pupils was Paul Langevin, who was later instrumental in the development of sonar technology, an application of piezoelectricity that used sound waves to detect underwater vessels. 6,7,26,47,48,62 This sonar device generated echoes that reflected off of underwater objects, applying pressure to piezoelectric transducers upon their return, which converted the signal to electricity and allowed for the calculation of the range, speed, and position of underwater objects. 6,7,26,47,48,62 the Power Couple of Physics: Pierre and marie Pierre Curie and Marie Skłodowska (Fig.…”