Sound film e GPS (satellite navigation): o que têm em comum

1. Passo 1. Sound film — utiliza — Photovoltaic effect. The optical soundtrack was read by a photocell.
2. Passo 2. Photovoltaic effect — é utilizado em — Solar panel. The photoelectric effect in a semiconductor.
3. Passo 3. Solar panel — faz parte de — Artificial satellite. Powering satellites.
4. Passo 4. Artificial satellite — faz parte de — GPS (satellite navigation). A constellation of satellites.

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