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.
Although some radiations are marked as N for no in the diagram, some waves do in fact penetrate the atmosphere, although extremely minimally compared to the other radiations Legend[2][3][4]| 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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Washington Post
... weaponization of the electromagnetic spectrum , a silent "final solution" that may have the nation's political leadership in its ideological cross-hairs. ...
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