| A | B |
|---|
| wave | a disturbance that transfers (moves) energy from place to place |
| energy | the ability to do work |
| medium | the material (stuff) that a wave travels through (gas, liquid, solid) |
| tranparent | a material that allows light to pass through so objects can be seen |
| translucent | a material that allows light to pass through but scatters the light |
| opaque | a material that does not allow light to pass through, not transparent |
| frequency | number of complete waves over a certain period of time |
| hertz (Hz) | the unit of measurement of frequency |
| transmit | when light passes through an object |
| reflection | when an object or a wave hits the surface of something it cannot pass through, it bounces back |
| refraction | when light passes through a material that causes it to change direction or bend |
| diffraction | when waves pass through an object and bends and spread out |
| lumen | amount of light that the source gives off |
| lux | the total amount of light that hits an object |
