Example image of eyePlorer eyePlorer map for 'Electromagnetic radiation': Matter Phenomenon Vacuum Wave Wave propagation Electric field Magnetic field Oscillation Frequency Gamma ray Infrared Microwave Radio waves Terahertz radiation Ultraviolet Visible spectrum X-ray Eye Light Organism Sense Momentum Heinrich Hertz James Clerk Maxwell Electromagnetic wave equation Speed of light Maxwell's equations Quantum electrodynamics Quantum theory Classical electromagnetism Electromagnetism Physics Euclidean vector Superposition principle Atom Emission spectrum Diffraction Refraction Crystal Faraday effect Kerr effect Density Snell's law Dispersion Electromagnetic spectrum Subatomic particle Wave–particle duality Photon Photomultiplier Interferometry