Sputnik 1 and sonar: what they have in common

1. Step 1. Sputnik 1 — has part — Antenna. Four whip antennas.
2. Step 2. Antenna — is part of — Radar. An antenna emits and receives.
3. Step 3. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.

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