| Term | Definition |
|---|
| Electromagnetic Spectrum | All types of light energy, from microwaves to visible light to radio waves. |
| Vacuum | Light moves fastest in a _________. |
| Vacuum | An empty space, containing no matter, not even air. |
| The Speed of Light | 300,000 km/s (in a vacuum) - |
| Decreases | When light moves through a medium, such as air or water, it's speed |
| Wavelength | The distance between two tops (crests) of a wave |
| Decreases | An electromagnetic wave increases in energy as its wavelength __________... |
| Crest | The highest point of a wave is called its ___________... |
| Trough | The lowest point of a wave is called its ____________... |
| Amplitude | Distance between crests (or troughs) is called a wave's ___________... |
| Frequency | Describing the number of crests occurring in a second- how often waves occur - measured in Hertz. |
| Hertz | Frequency is measured in these units. |
| Decreases | As the wavelength increases, the frequency __________... |
| Amplitude | The height of a wave (measured from its midpoint to its crest or trough), is the wave's ______________... |
| Hertz | Cycles per second. |
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