| A | B |
|---|
| sound | A disturbance that travels through a medium as a longitudinal wave |
| speed of sound | depends on the elasticity, density, and temperature of the medium |
| elasticity | the ability of a material to bounce back after being disturbed |
| density | how much matter, or mass, there is in a given amount of space, or volume |
| intensity | the amount of energy the wave carries per second through a unit area |
| loudness | describes what you actually hear |
| decibels (dB) | the unit of measurement of loudness, or sound level |
| ultrasound | sound waves with frequencies above the normal human range of hearing |
| infrasound | sounds with frequencies below the normal human range of hearing |
| pitch | description of how high or low the sound seems to a person |
| Doppler effect | as a sound source moves toward the listener, the waves reach the listener with a higher frequency - the pitch appears to increase |
| timbre | the blending of the fundamental tone and the overtones makes up the characterics sound quality of a particular sound |
| music | a set of tones combined in ways that are pleasing to the ear |
| noise | a mixture of sound waves that do not sound pleasing together - it has no identifiable pitch and no pleasing timbre |
| dissonance | the sound produced when when notes that have no musical relationship are played together |
| interference | occurs when two or more sound waves interact |
| acoustics | describes 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 |
