23: Electromagnetic Waves Last updated Nov 5, 2020 Save as PDF 22.4: Magnetic Fields and Maxwell Revisited 23.1: The Electromagnetic Spectrum Page ID15659 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy23.1: The Electromagnetic SpectrumRadio waves are EM (Electromagnetic)waves that have wavelengths between 1 millimeter and 100 kilometers (or 300 GHz and 3 kHz in frequency).23.2: Electromagnetic Waves and their PropertiesMaxwell’s equations help form the foundation of classical electrodynamics, optics, and electric circuits.23.3: Applications of EM WavesWireless communication is the transfer of information between two or more points that are not connected by an electrical conductor.