| A | B |
|---|
| Wave | rhymic disturbances that carry energy WITHOUT carrying matter |
| medium | the matter through which a mechanical wave travels |
| mechanical wave | type of wave which uses matter to travel; two types of these waves are transverse and compressional |
| transverse wave | causes the matter in the medium to move up and down or back and forth at right angles to the direction the wave travels |
| crest | high point of a transverse wave |
| trough | low point of a transverse wave |
| compressional wave | matter in the medium moves forward and backward in the same direction that the wave travels |
| sound wave | type of compressional wave |
| electromagnetic wave | doesn't need matter in which to travel |
| amplitude | the distance from the crest to the rest position or from the trough to the rest position |
| wave length(transverse wave) | distance from the top of one crest to the top of the next crest, or from the bottom of one trough to the bottom of the next trough |
| frequency | the number of wavelengths that pass a given point in 1 s. |
| hertz | unit of frequency |
| pitch | highness or lowness of a sound |
| speed of light | 300 million meters per second |
| speed of sound | 340 meters per second |
