Electromagnetic spectrum | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Electromagnetic spectrum


00:01:47 1 History and discovery
00:05:59 2 Range
00:07:43 3 Regions
00:09:37 3.1 Rationale for names
00:13:36 4 Types of radiation
00:14:15 4.1 Radio frequency
00:14:25 4.2 Microwaves
00:16:23 4.3 Terahertz radiation
00:17:51 4.4 Infrared radiation
00:18:38 4.5 Visible radiation (light)
00:20:44 4.6 Ultraviolet radiation
00:23:17 4.7 X-rays
00:25:43 4.8 Gamma rays
00:27:03 5 See also
00:28:00 6 Notes and references
00:28:09 7 External links
00:28:18 undefined



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SUMMARY
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The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
The electromagnetic spectrum covers electromagnetic waves with frequencies ranging from below one hertz to above 1025 hertz, corresponding to wavelengths from thousands of kilometers down to a fraction of the size of an atomic nucleus.  This frequency range is divided into separate bands, and the electromagnetic waves within each frequency band are called by different names; beginning at the low frequency (long wavelength) end of the spectrum these are: radio waves, microwaves, terahertz waves, infrared, visible light, ultraviolet, X-rays, and gamma rays at the high-frequency (short wavelength) end.  The electromagnetic waves in each of these bands have different characteristics, such as how they are produced, how they interact with matter, and their practical applications.  The limit for long wavelengths is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length.  Gamma rays, X-rays, and high ultraviolet are classified as ionizing radiation as their photons have enough energy to ionize atoms, causing chemical reactions. Exposure to these rays can be a health hazard, causing radiation sickness, DNA damage and cancer.  Radiation of visible light wavelengths and lower are called nonionizing radiation as they cannot cause these effects.
In most of the frequency bands above, a technique called spectroscopy can be used to physically separate waves of different frequencies, producing a spectrum showing the constituent frequencies.  Spectroscopy is used to study the interactions of electromagnetic waves with matter.  Other technological uses are described under electromagnetic radiation.