| A | B |
|---|
| vibrations | quick back and forth motions |
| sound | produced by objects vibrating in the air |
| compression | bunched-up particles in a vibration |
| rarefaction | spread-out particles in a vibration |
| sound quality | depends on instrument's size and shape |
| hertz | measure of frequency |
| frequency | vibrations per second |
| ultrasonic | sounds above 20,000 Hz |
| audiogram | visual record of sound vibrations |
| decibels | measure of intensity |
| noise | term used to describe unpleasant sounds |
| low pitch | long, thick loose, vibrating string |
| high pitch | short, thin, tense, vibrating string |
| medium | substance sound travels through |
