| Term | Definition |
|---|
| electromagnetic wave | made by vibrating electric charges and can travel through space whwere matter is not present |
| radiant energy | the energy transferred by an electromagnetic wave |
| photon | energy depends on the freguency of the waves |
| visible light | a small portion of the entire electromagnetic spectrum |
| radio wave | low-frequency electromagnetic waves with wavelengths longer than about 1 mm. |
| microwave | radio waves with wavelengths of less than 30 cm |
| infared wave | a type of electromagnetic wave with wavelengths between about 1 mm and 750 billionths of a meter |
| ultraviolet wave | electromagnetic waves with wavelengths from about 400 billionths to 10 billionths of a meter |
| X ray | have wavelengths between about 10 billionths of a meter and 10 trillionths of a meter |
| gamma ray | electromagnetic waves with wavelengths shorter than about 10 trillionths of a meter |
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