| A | B |
|---|
| electromagnetic spectrum | the complete range of electromagnetic waes placed in order of increasing frequency |
| radio waves | electromagnetic waves with the longest wavelenghts and lowest frequencies |
| radar | a system that uses reflected radio waves to detect objects and measure their distance and speed |
| infrared rays | electromagnetic waves with wavelenghts shorter than radio wwaves, but longer than visible light |
| thermogram | an image that shows regions of different temperatures in different colors |
| visible light | electromagnetic waves that are visible to the human eye |
| ultraviolet rays | electromagnetic waves with wavelenghts shorter than visible light, but longer than X-rays |
| gamma rays | electromagnetic waves with the shortest wavelenghts and the highest frequencies |
| microwaves | radio waves with the shortest wavelenghts and the highest frequencies |
| x-rays | electromagnetic waves with wavelenghts shorter than ultraviolet rays, but longer than gama rays |
