| A | B |
|---|
| elasticity | The ability of a material to bounce back after being disturbed |
| larynx | Two folds of tissue that make up the human voice box. |
| density | Ratio of mass of a substance to its volume. |
| intensity | The amount of energy per second carried through a unit area by a wave |
| loudness | Perception of the intensity of a sound. |
| decibels | A unit of measurement of loudness. |
| ultrasound | Sound waves with frequencies above 20,000 Hz. |
| infrasound | Sound waves with frequencies below 20 Hz. |
| pitch | Perception of the frequency of a sound. |
| Doppler effect | The apparent change in frequency of a sound as the source moves in relation to the listener. |
| timbre | The overall quality of a sound. |
| music | A set of tones and overtones combined in ways that are pleasing to the ear. |
| noise | A mixture of sound waves with no pleasing timbre and no identifiable pitch. |
| dissonance | The sound produced when notes that have no musical relationship are played together. |
| acoustics | The studyof how well sounds can be heard in a particular room or hall. |
| beats | the regular changes in loudness of a sound when two sounds of different frequencies are played together. |
| ear canal | A narrow region leading from the outside of the human ear to the eardrum. |
| middle ear | The space behind the eardrum. |
| cochlea | A fluid-filled cavity behind the inner ear. |
| sonar | A system of detecting reflected sound waves. |
| echolocation | The use of reflection of sound waves to navigate and to locate prey. |
| sonogram | An image formed by an ultrasound machine. |
