| A | B |
|---|
| sounds move fastest in these media | solids |
| apparent change in pitch of a sound caused by motion of the object making the sound | Doppler effect |
| sounds with frequencies too low for human ear to hear | infrasonic |
| area of a sound wave where particles are squeezed close together a | compression |
| human perception of loudness | intensity |
| condition of a medium that affects the speed at which a sound wave travels | temperature |
| produce sounds | vibrations |
| matter vibrates in the same direction as these waves travel | compressional waves |
| vibrate when you talk | vocal cords |
| unit of sound intensity | decibel |
| area of a sound wave where particles are less dense | rarefaction |
| frequencies too high-pitched for the human ear to hear | ultrasonic |
| the highness or lowness of a sound | pitch |
| distance between two side by side compressionsof the same wave | wavelength |
| number of compressions that pass a place each second | frequency |
| has eight notes | scale |
| describes the difference between two sounds having the same pitch | quality |
| effect produced by many reflections of sound | reverberation |
| produced when an instrument vibrates | resonance |
| the study of sound | acoustics |
| ability of two or more waves to combine and form a new wave | interference |
| variations of sound intensity | beats |
| tone produced by one vibration of a string | fundamental |
| sounds that follow a regular pattern | music |
| frequency range of the musical scale | octave |
| produced by vibrations that are multiples of the fundamental frequency | overtones |
| has no set pattern or definite pitch | noise |
