Photodiode and radar: what they have in common

1. Step 1. Photodiode — is a kind of — Diode. A kind of diode.
2. Step 2. Diode — is part of — Crystal radio. A crystal detector is a diode.
3. Step 3. Crystal radio — has part — Antenna. An antenna.
4. Step 4. Antenna — is part of — Radar. An antenna emits and receives.

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