| A | B |
|---|
| larynx | two folds of tissue that make up the human voice box p.41 |
| elasticity | the ability of a material to bounce back after being disturbed |
| density | ratio of the mass of a substance to its volume p.43 |
| intensity | the amount of energy per second carried through a unit area by a wave p.46 |
| loudness | perception of the intensity of a sound p.47 |
| decibels | a unit of measurement of loudness p. 47 |
| ultrasound | sound waves with frequencies above 20,000 Hz. p. 48 |
| infrasound | sound waves with freqencies below 20 Hz. p. 48 |
| pitch | perception of the frequency of a sound p.48 |
| Doppler effect | the apparent change in frequency of a sound as the source moves in relation to the listener p. 50 |
