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PHYSICASCIENCE am
chapter 21 vocab terms- The Nature of Sound
| term | definition |
|---|---|
| sound wave | a longitudinal wave that is caused by vibrations and that travels through a material medium |
| medium | a physical enviroment in which phenomena occur |
| pitch | a measure of how high or low a sound is percieved to be, depending on the frequncy of the sound wave |
| Doppler effect | an observed change in the frequncy of a wave the source or observer is moving |
| loudness | 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 |
| echlocation | the process of using reflected sound waves to find objects; used by animals such as bats |
| interference | the combination 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 frquency; 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 frequncies |
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