Mechanical clock und radar: was sie gemeinsam haben

1. Schritt 1. Mechanical clock — entwickelte sich zu — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
2. Schritt 2. Quartz clock — nutzt — Piezoelectric effect. The quartz resonator vibrates thanks to the piezoelectric effect.
3. Schritt 3. Piezoelectric effect — wird verwendet in — Sonar. Langevin’s transducer is piezoelectric quartz.
4. Schritt 4. Sonar — funktioniert wie — Radar. The same echolocation principle: sound in water instead of radio waves.

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