| A | B |
|---|
| Sound navigation and ranging | sonar |
| echolocation | Sending out ultrasound waves and interpreting the returning sound echoes. |
| acoustics | The scientific study of sound. |
| amplification | The increasing of the strength of an electrical signal. |
| decibel | A unit used to measure sound intensity. |
| intensity | The amount of energy a sound wave has. |
| Doppler effect | The change in perceived pitch that occurs when the source or the receiver of a sound is moving. |
| resonance | The strengthening of a sound wave by adding amplitudes of sounds. |
| ultrasound | Sound waves in the range above 20,000 hertz. |
| hertz | One complete wave, or cycle, per second. |
| pitch | The characteristic of highness and lowness of a sound. |
| vacuum | Empty space |
| Sound | A wave that is produced by vibrating object and travels through matter. |
| Vibration | The disturbances that travel in a sound wave are vibrations. |
