Doppler effect and diesel engine: what they have in common

1. Step 1. Doppler effect — is used in — Ultrasound scanner. Doppler imaging of blood flow.
2. Step 2. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.
3. Step 3. Sonar — is part of — Submarine. Underwater acoustics.
4. Step 4. Submarine — has part — Diesel engine. Diesel-electric submarines.

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