| A | B |
|---|
| amplitude | The maximum displacement from the rest position of a wave. |
| crest | The high point of a wave. |
| diffraction | The spreading of waves around the edge of a barrier. |
| frequency | The number of vibrations per second. |
| interference | The result of the superposition of two or more waves. |
| law of reflection | The angle of incidence equals the angle of reflection. |
| longitudinal wave | The particles of the medium vibrate parallel to the direction of the wave. |
| period | The time interval for one complete wave motion. |
| refraction | The change in direction of waves at the boundary between two different media. |
| transverse wave | The particles of the medium vibrate perpendicular to the direction of the wave. |
| trough | The low point of a wave. |
| wavelength | The shortest distance between two corresponding parts of a wave. |
