| A | B |
|---|
| Unit used to measure the intensity of a sound wave (how loud) | Decibel |
| Unit used to measure frequency | Hertz |
| The highness or lowness of a sound | Pitch |
| The study of sound; how a sound wave behaves inside a space | Acoustics |
| The change in perceived pitch that occurs when the source or the one who hears the sound is moving | Doppler Effect |
| How much energy is in a wave; this affects how loud a sound is | Intensity |
| The strengthening of an electrical signal, often used to increase the intensity of a sound wave | Amplification |
| Sound waves below 20 Hz | Infrasound |
| Strengthening of a sound wave when it combines with something's natural frequency | Resonance |
| Sending out ultrasound waves and interpretting the returning echoes | Echolocation |
| Sound waves above 20,000 Hz | Ultrasound |
| Instruments that use echolocation to find objects underwater | Sonar |
