| A | B |
|---|
| amplitude | in any periodic function (e.g., a wave) the maximum absolute variation of the function |
| crest | the peak or highest point on a wave |
| diffraction | the change in direction of a wave caused by passing by an obstacle or traveling through an opening; the bending of a wave around an obstruction |
| frequency | the number of cycles or waves per unit time |
| radiation | emission of energy in the form of rays or waves |
| reflection | the bouncing off or turning back of light, sound, or heat from a surface |
| refraction | a change in the direction of a wave that occurs as it passes from one medium to another of different density |
| trough | the lowest point on a wave |
| vibration | a repetitive movement around an equilibrium point |
| wavelength | the distance between crests of a wave |
