| A | B |
|---|
| temperature and medium | influence speed of sound |
| pitch | how high or low a sound is perceived to be |
| frequency | the number of waves produced in a given amount of time |
| hertz (Hz) | the unit used to express frequency |
| sonic | root word meaning sound |
| infra- | prefix meaning below |
| ultra- | prefix meaning beyond |
| ultrasonic | sounds with frequencies above 20,000 Hz |
| infrasonic | sounds with frequencies below 20 Hz |
| ultrasonic waves | waves used to clean jewelry, break up kidney stones, and remove ice from metal |
| Doppler effect | the apparent change in the frequency and pitch of a sound caused by the motion of either the source of the sound or the listener |
| amplitude | Loudness is determined by this |
| decibel (dB) | most common unit used to express loudness |
| 120 dB | “Threshold of Pain” |
| hearing loss | caused by continued exposure to sounds above 85 dB |
| oscilloscope | device used to graph representations of sound waves |
