| A | B |
|---|
| wave | disturbance in energy |
| crest | highest point on the wave |
| trough | lowest point on the wave |
| wavelength | distance between crests or troughs |
| amplitude | height of the wave |
| frequency | how many waves hit a certain point every second |
| transverse wave | propagation perpendicular to oscillation |
| longitudinal wave | propagation parallel to oscillation |
| medium | substance a wave travels through |
| sound | must have a medium to travel through |
