Mechanical clock e radar: o que têm em comum

1. Passo 1. Mechanical clock — evoluiu para — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
2. Passo 2. Quartz clock — utiliza — Piezoelectric effect. The quartz resonator vibrates thanks to the piezoelectric effect.
3. Passo 3. Piezoelectric effect — é utilizado em — Sonar. Langevin’s transducer is piezoelectric quartz.
4. Passo 4. Sonar — funciona como — Radar. The same echolocation principle: sound in water instead of radio waves.

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