| Term | Definition |
| Wave | Something that moves through matter or space. |
| Transverse wave | Causes Particles to move back and Forth (Right angles) |
| Compressional Wave | Causes particles to move back and forth (the same direction ) |
| Wavelength | The distance between one point on a wave and the nearest point moving with the same speed and direction |
| Frequency | The number of wavelengths that pass by a pony each second |
| Law of Reflection | The angle the the incoming wave makes with the normal equal the angle that the outgoing wave makes with the normal. |
| Diffraction | The bending of waves around a object. |
| Refraction | The change in direction of a wave when it changes speed as it travels. |
| Amplitude | The height of a wave. |
| Crest | The top of the wave |
| Rarefaction | When the molecules of a waves expand and have space. |
| Congressional | When the molecules of a wave are forced or pressed together |
| Trough | The lower ends of a wave |
| Opaque | Objects allow no light to pass |
| Translucent | Allow some light to pass objects |
| Transparent | Nearly all light can pass thought objects |
| Reflect | To throw back light |
| Absorb | Take in light |
| Transmit | Causes something to pass on from one place or person to another. |
| Matter/Medium | intermediate course through which signals or waves can travel through , and a physical substance. |
| Energy Transfer | The transfer of energy from one object or material to another. |
| Nuclear reactions | he process in which two nuclei |
| Vibration | Something moving in motion |
| Energy | The property of matter and radiation to perform work |
| Sound Waves | A type of wave that is compressional |
| Sun's Radion | Radiant energy emitted by the sun from a nuclear reaction that creates electromagnetic energy |
| Water wave | A gravity wave on water |
| Seismic Waves | Earthquakes are an example. |
| Light energy | Radiant energy is the energy of electromagnetic waves. |
| Light ray | Is a narrow beam of light that travels in a straight line |
