| A | B |
|---|
| medium | substance through which waves can travel |
| waves | disturbances that transfer energy from place to place |
| compression | part of a medium where the particles are close together |
| crest | high point of a wave |
| logitudinal wave | wave in which the particles of the medium move back and forth in the directions of the wave motion |
| rarefaction | part of a medium where the particles are far apart |
| transverse wave | wave in which the particles of the medium move up and down at right angles to the direction of the wave motion |
| trough | low point of a wave |
| amplitude | height of a wave |
| frequency | number of complete waves passing a point in a given time |
| hertz | unit used to measure the frequency of a wave |
| wavelength | distance between two neighboring crests or troughs |
| incident wave | wave that strikes a barrier |
| normal | line at right angles to the barrier |
| reflected wave | wave that bounces back from a barrier |
| reflection | bouncing back of a wave after striking a barrier |
| refraction | bending of a wave as it moves from one medium to another |
| doppler effect | apparent change in the frequency of waves |
