| A | B |
|---|
| acoustics | the study of 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 |
| cochlea | a snail-shaped tube in the inner ear lined with sound receptors;nerve impulses are sent from the cochlea to the brain |
| decibels(dB) | a unit of measurement of loudness |
| dissonance | the sound produced when notes that have no musical relationship are played together |
| doppler effect | the apparent change in frequency of a sound as the source moves in relation to the listener |
| ear canal | a narrow region leading from the outside of the human ear to the eardrum |
| eardrum | the small,tightly stretched drumlike membrane that seperates the outer ear from the middle ear, and that vibrates when sound waves strike it |
| echolocation | the use of reflection of sound waves to navigate and to locate prey |
| elasticity | the ability of a material to bounce back after being disturbed |
| infrasound | sound waves with frequencies below 20 Hz |
| intensity | the amount of energy per second carried through a unit area by a wave |
| larynx | two folds of tissue that make up the human voicebox; located in the top part of the trachea,underneath the epiglottis |
| loudness | perception of the intensity of a sound |
| music | a set of tones and overtones combined in ways that are pleasing to the ear |
| middle ear | the space behind the eardrum |
| noise | a mixture of sound waves with no pleasing timbre and no identifiable pitch |
| pitch | perception of the frequency of a sound |
| sonogram | an image formed by an ultrasound |
| sound | a disturbance that travels through a medium as a longitudinal wave |
| sonar | a system that determines the distance of an object under water by recording echoes of sound waves;gets its name from sound navigation and ranging |
| timbre | the overall quality of a sound |
| ultrasound | sound waves with frequencies above 20,000 Hz |
