Electromagnetic Spectrum
The electromagnetic spectrum, showing the major categories of electromagnetic waves. The range of frequencies and wavelengths is remarkable. The dividing line between some categories is distinct, whereas other categories overlap. Microwaves encompass the high frequency portion of the radio section of the EM spectrum.
Source
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"OpenStax College, College Physics. April 28, 2014."
http://cnx.org/content/m42444/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.