| A | B |
|---|
| Sound Wave | a longitudinal wave that is caused by vibrations and that travels through a material medium |
| medium | a physical environment in which phenomena occur |
| pitch | a measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave |
| Doppler Effect | an observed change in the frequency of a wave when the source or observer is moving. |
| loundness | the extent to which a sound can be heard |
| decibel | the most common unit used to measure loudness (symbol dB) |
| echo | a reflected sound wave |
| echolocation | the process of using reflected sound waves to find objects; used by animals such as bats |
| interference | the combintation of two or more waves that results in a single wave |
| sonic boom | the explosive sound heard when a shock wave from an object traveling faster than the speed of sound reaches a person's ears |
| standing wave | a pattern of vibration that simulates a wave that is standing still |
| resonance | a phenomenon that occurs when two objects naturally vibrate at the same frequency; the sound produced by one object causes the other object to vibrate |
| sound quality | the result of the blending of several pitches through interference |
| noise | a sound that consists of a random mix of frequencies |
