"Radio waves have the longest wavelengths in the electromagnetic spectrum with wavelengths ranging from approximately 1mm to several hundred meters. Radio waves are used to transmit a variety of data. Wireless networking, television and amateur radio all use radio waves." (Humboldt State University, 2014)


"Electromagnetic Spectrum". Humboldt State Geospatial Online, Humboldt State University. 2014.….
Accessed February 1, 2019.