🔍 Key Concepts

• How a fathometer (echo sounder) sends a pulse into the water and receives the echo • The specific device that changes electrical energy into sound waves (and often back again) • Difference between devices that create, change, or boost electrical signals (transmitter, amplifier) vs those that convert one form of energy to another

💭 Think About

• Which component in an echo sounding system is actually in contact with the water and responsible for sending out and receiving sound waves? • Among the choices, which term is most closely associated with converting electrical signals into mechanical vibrations (sound) and sometimes the reverse? • Which devices mainly handle electrical signals only, and which one is known for changing energy from one form (electrical) to another (acoustic)?

✅ Before You Answer

• Identify which option is defined as a device that converts one form of energy to another • Eliminate any options that mainly boost signal strength without changing energy type • Eliminate any options that mainly send or receive radio-frequency signals rather than produce underwater sound waves