| A | B |
|---|
| sound | a type pf wave that is produced by a vibrating object and is transferred through matter. |
| vibration | a rapid, back-and-forth motion |
| vacuum | a space containing few or no particles of matter |
| larynx | contains the vocal chords |
| cochlea | recieves sounds and sends messages to the brain |
| pitch | the quality of highness or lowness of a sound. It is accociated with frequency of a sound wave. |
| hertz (Hz) | the unit used to measure frequency. It is equal to one complete wave per second. |
| ultrasound | sound waves with frequencies above 20,000 Hz, the upper limit of typical hearing levels in humans, used for medical purposes, among other things. |
| infrasonic | sound waves with frequencies below 20 Hz. Typically too low for humans to hear. |
| resonance | the strengthening of a sound wave when it combines with an objects natural vibration |
| Doppler effect | The change of a percieved pitch that occurs when the source, or the one who hears it is moving |
| intensity | the amount of energy of a wave. It is associated with amplitude and refers to how loud or quiet a sound appears |
| decibel (dB) | the unit used to measure the intensity of a sound wave |
| amplification | the strengthening of an electrical signal, often used to increase the intensity of a sound wave |
| acoustics | the scientific study of sound; the behavior of sound waves inside a space |
| echolocation | the sending out of high-pitched sound waves and the interpretation of the returning echoes |
| sonar | instruments that use echolocation to locate objects underwater; acronym for "Sound Navigation and Ranging" |
