| A | B |
|---|
| Compression | the part of the wave where the particles are closest together |
| Frequency | the number of times a wave makes a complete cycle in a second |
| Wavelength | distance between one point on a wave to the next similar point on a wave |
| Pitch | a measure of whether a sound seems high or low |
| reflection | the bouncing back of a wave off an object or surface |
| absorption | the taking in of light energy by an object |
| transparent | describes materials that let nearly all the light rays that hit them pass through |
| translucent | describes materials that let some light rays pass through but scatters some of the other rays |
| opaque | describes materials do not let any light pass through them |
| refraction | bending of light caused by the change of speed that occurs when light rays pass from one transparent medium to another |
