| A | B |
|---|
| acoustics | the study of sound |
| amplitude | a measure of the greatest movement of matter from its normal resting position |
| compression | the part of a compressional wave where the particles of matter are pushed close together |
| longitudinal (compressional) wave | a wave in which the particles of matter move back and forth parallel to the direction of the wave |
| decibel | the unit used to measure sound intensity |
| diffraction | the spreading out of waves past the edge of a barrier |
| Doppler effect | the change in pitch that occurs when the source of a sound and the listener are moving in relation to each other |
| frequency | the number of waves that pass a given point each second |
| intensity | the loudness of a sound (amplitude of a sound wave) |
| interference | the effect caused by two or more waves passing through a medium at the same time |
| pitch | how high or low a sound is |
| rarefaction | the part of a compression wave where particles of matter are spread apart |
| reflection | the bouncing back of waves that strike a surface |
| refraction | the change in direction of waves as it passes from one medium to another |
| resonance | the response that an object has to vibrations that match its natural frequency |
| transverse wave | a wave in which particles of matter vibrate up and down at right angles to the direction in which the wave travels |
| wavelength | the distance from any point on a wave to the same point on the next wave |
