Electromagnetic spectrum
From Wikipedia, the free encyclopedia
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.[1] The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
The electromagnetic spectrum extends from below frequencies used for modern radio to gamma radiation at the short-wavelength end, covering wavelengths from thousands of kilometers down to a fraction of the size of an atom. The long wavelength limit is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length, although in principle the spectrum is infinite and continuous.
| γ= Gamma rays | MIR= Mid infrared | HF= High freq. |
| HX= Hard X-Rays | FIR= Far infrared | MF= Medium freq. |
| SX= Soft X-Rays | Radio waves | LF= Low freq. |
| EUV= Extreme ultraviolet | EHF= Extremely high freq. | VLF= Very low freq. |
| NUV= Near ultraviolet | SHF= Super high freq. | VF/ULF= Voice freq. |
| Visible light | UHF= Ultra high freq. | SLF= Super low freq. |
| NIR= Near Infrared | VHF= Very high freq. | ELF= Extremely low freq. |
| Freq=Frequency |
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Radio waves
From Wikipedia, the free encyclopedia
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Naturally-occurring radio waves are produced by lightning, or by astronomical objects. Artificially-generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, satellite communication, computer networks and innumerable other applications. Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves may cover a part of the Earth very consistently, shorter waves can reflect off the ionosphere and travel around the world, and much shorter wavelengths bend or reflect very little and travel on a line of sight.
Contents
[hide]- 1 Discovery and utilization
- 2 Propagation
- 3 Radio communication
- 4 Special properties of RF electrical signals
- 5 In medicine
- 6 See also
- 7 References
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Electromagnetic spectrum - Wikipedia, the free encyclopedia
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| electromagnetic spectrum radio wave | infrared waves electromagnetic spectrum | electromagnetic spectrum radio waves | high frequency magnetic field |
| frequency range radio waves | high frequency radio waves | low frequency radio waves |
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