| A | B |
|---|
| wave | A disturbance that transmits energy from one location to another. |
| medium | a substance through which a wave can travel. |
| transverse wave | A wave in which the particles of the wave's medium vibrate perpendicular to the direction the wave is traveling. |
| longitudinal wave | A wave in which the particles of the medium vibrate back and forth along the path that the wave travels. |
| amplitude | The distance a wave vibrates from its rest position. |
| wavelength | The distance between one point on a wave and the corresponding point on an adjacent wave in a series of waves. |
| frequency | The number of waves produced in a given amount of time. |
| rarefaction | When the back motion of a longitudinal wave spreads out particles of the medium. |
| compression | When the forward motion of a longitudinal wave compresses the particles of the medium. |
| hertz | Wave frequency is measured in this unit. |
| crest | This is the top of a transverse wave. |
| trough | This is the bottom of a transverse wave. |
| decibel | This is the measure of a sound's intensity. |
| Doppler Effect | The apparent change in pitch of a wave due to its motion. |
| Heinrich Rudolf Hertz | This German physicist has a sound unit named for him. |
| Christian Doppler | This Austrian scientist identified the apparent shift in waves. |
