| A | B |
|---|
| loudness | perception of the energy of a sound |
| decibel (dB) | a unit used to compare the loudness of different sounds |
| ultrasound | sound waves with frequencies above 20,000 Hz |
| larynx | two folds of tissue that make up the human voice box |
| intensity | the amount of energy per second carried through a unit area by a wave |
| pitch | perception of the frequency of a sound |
| infrasound | sound waves with frequencies below 20 Hz |
| doppler effect | the change in frequency of a wave as its source moves in relation to an observer |
