| A | B |
|---|
| Wave Length | Distance from any point on a wave to the corresponding point on an adjacent wave. |
| Frequency/ Cycle | Number of waves in a given time period |
| Amplitude | The height of a wave from its resting position |
| Crest | The highest point of a wave. |
| Trough | The lowest point of a wave. |
| Medium | Matter that a sound wave travels through |
| Transverse Waves | A wave that travels in an up and down motion – Radiant Energy and the Electromagnetic Spectrum |
| Longitudinal Waves | A wave that travels forward and backward – Sound Energy |
| Electromagnetic Spectrum | The full range of electromagnetic waves that can travel through empty space (vacuum) as well as through matter |
| Reflection | Bouncing back of a light wave from a surface |
| Refraction | Bending of a wave light as it moves across the boundary between one medium to the next |
| Lens | Curved, transparent piece of glass or plastic that bends light rays to form an image |
| Mirror | A piece of glass that has a thin coating of metal that makes the surface shiny and reflects light |
| Compression | The part of a sound wave where the matter is pushed together (squeezed). |
| Rarefactions | Part of a sound wave in which the wave pushes matter farther apart. |
| Transmit/Transparent | Allows light to pass through easily |
| Sound | Vibration causing a medium to form a compression wave |
| Concave | Discribes a lens or mirror that curves inward |
| Convex | Discribes a lens or miror that curves outward |
| Absorption | When light energy is not reflected or transmitted, it is kept by the matter it hits and is changed to heat energy |
