| A | B |
|---|
| sound | energy you can hear that travels as waves |
| vibrations | back-and-forth movements of matter |
| compression | particles pushed closer together with higher air pressure |
| rarefaction | area with fewer particles with lower air pressure |
| crests | region of great air pressure |
| troughs | regions of low air pressure |
| wavelength | distance from one compression to the next |
| frequency | number of complete waves in time |
| high frequency | high sound |
| low frequency | low sound |
| amplitude | distance from rest to crest or rest to trough |
| timbre | sound made by each musical instrument |
| overtones | softer, higher tones mixed with the basic tone |
| noise | unpleasant combinations of sound waves |
