For the Japanese term denpa see denpa-kei.
Overview![編集](https://s.pximg.net/source/dic/images/icon_edit_partial.svg?20120424)
Radio waves (電波, denpa) are electromagnetic waves with a longer wavelength (lower frequency) than infrared radiation. Radio wave has a frequency of 3 million MHz (= 3,000 GHz = 3 THz) or lower, as defined by the Radio Act.
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