| Keyword | Definition |
|---|---|
| frequency | a measure of how many times a sound wave goes up and down each second |
| sound | vibrations that can be detected by a human ear and are interpreted by the brain as noise, speech or music |
| vibrations | changes in air pressure that can cause sound |
| wave | something that oscillates (goes up and down) in a predictable pattern |
| wavelength | a measure of the distance between two peaks of a sound wave |
