FM (frequency modulation), AM (amplitude modulation), sound wave; see frequency 2.
"radio wave." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/radio-wave>.
radio wave. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/radio-wave
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