| Term | Definition |
|---|
| Big Bang Theory | Theory that the universe started with a big |
| Electromagnetic Wave | Waves created by vibrating electrical charges; travels through vacuum and matter. Has a wide variety of frequencies and wavelengths. |
| Radiant Energy | The energy transferredby an electromagnetic wave. It makes a fire feel warm and enables you to see. |
| Photon | Particle that electromagnetic waves sometimes behave like; has energy that increases as the frequency of electromagnetic waves increase. |
| Visible Light | Electromagnetic waves that humans can detect with their eyes. It is 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 between about 1m and 1mm. |
| Infrared Wave | Electromagnetic waves that have a wavelength between about 1mm and 750 billionths of a meter. |
| Ultraviolet Wave | Electromagnetic waves wit wavelengths from about 400 billionths to 10 billionths of a meter. They are energetic enough to enter skin cells. Overexposure to these waves can cause skin damage and cancer. |
| X Ray | Electromagnetic waves with wavelengths between about 10 billionths of a meter and 10 trillionths of a meter. X Rays are often used for medical imaging. |
| Gamma Ray | Electromagnetic wave with no mass and no charge that travels at the speed of light; has a wavelength less than about 10 trillionths of a meter. |
| Carrier Wave | Specific frequency that a radio station is assigned and uses to broadcast signals. |
| Cathode-Ray Tube | A sealed vacuum that produces one or more beams of electrons; produces an image when they strike the coating on th einside of a TV screen. |
| Transceiver | Like cellular phones or cordless phones. Transceiver transmits (sends) one radio signal |
| Global Positioning System | (GPS) A system of satellites, ground monitoring stations, and receivers that determine a person's or object's exact location at or above the Earth. |
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