Método Czochralski e optical telegraph: o que têm em comum

1. Passo 1. Método Czochralski — é utilizado em — Silicon wafer. Ingots are grown by the Czochralski method.
2. Passo 2. Silicon wafer — é material para — Integrated circuit. Chips are made on wafers.
3. Passo 3. Integrated circuit — faz parte de — Mobile phone. Inside a phone are microchips: processor, memory, radio.
4. Passo 4. Mobile phone — evoluiu de — Telephone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.
5. Passo 5. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
6. Passo 6. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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