| A | B |
|---|
| electromagnetic spectrum | arrangement of electromagnetic waves in order of wavelength |
| radio wave | electromagnetic waves with the longest wavelength |
| modulation | variation in the amplitude of an electromagnetic wave |
| microwave | high-frequency radio wave used primarily for communication |
| radar | use of short-wavelength microwaves to locate objects |
| infrared ray | found in the frequency range below visible light;felt as heat |
| visible light | wavelengths that can be seen with the unaided eye |
| ultraviolet ray | found in the frequency region just above visible light |
| X-ray | electromagnetic wave in the frequency range just above ultraviolet |
| gamma ray | high-frequency wave released during gamma decay |
