| A | B |
|---|
| electromagnetic wave | made by vibrating electric charges and can travel through space where matter is not present |
| radiant energy | energy carried by an electromagnetic wave |
| photon | a particle whose energy depends on the frequency of the waves |
| radio wave | low-frequency elctromagnetic waves with wavelengths longer than about 1mm |
| microwave | radio waves with wavelengths of less than about 30 cm |
| infrared wave | type of electromagnetic wave with wavelengths between about 1 mm and about 750 billionths of a meter |
| visible light | the range of electromagnetic waves that you can detect with your eyes |
| ultraviolet wave | electromagnetic waves with wavelengths from about 400 billionths to 10 billionths of a meter |
| X ray | have wavelengths between about ten billionths of a meter and ten trillionths of a meter |
| gamma ray | electomagnetic waves with wavelengths shorter than about 10 trillionths of a meter |
| carrier wave | the specific frequency of the electromagnetic wave that a radio station is assigned |
| cathode-ray tube | a sealed vacuum tube in which one or more beams of electrons are produced |
| transceiver | transmits one radio signal and receives another radio signal from a base unit |
| Global Positioning System (GPS) | a system of satellites, ground monitoring stations, and receivers that determine you exact location at or above Earth's surface |
