[{"n": "Radiance", "u": "/e/electromagnetism-and-radiation/radiance/", "s": "Radiance measures radiant flux per solid angle per projected area."}, {"n": "Radiant flux", "u": "/e/electromagnetism-and-radiation/radiant-flux/", "s": "Radiant flux measures the rate of radiant energy flow."}, {"n": "Radiation", "u": "/e/electromagnetism-and-radiation/radiation/", "s": "Energy emitted as waves or particles through space or matter."}, {"n": "Radiation pressure", "u": "/e/electromagnetism-and-radiation/radiation-pressure/", "s": "Mechanical pressure from electromagnetic radiation momentum exchange."}, {"n": "Radiative transfer", "u": "/e/electromagnetism-and-radiation/radiative-transfer/", "s": "Energy transfer via electromagnetic radiation through absorption, emission, scattering."}, {"n": "Radiometry", "u": "/e/electromagnetism-and-radiation/radiometry/", "s": "Techniques for measuring electromagnetic radiation power distribution."}, {"n": "Spontaneous emission", "u": "/e/electromagnetism-and-radiation/spontaneous-emission/", "s": "Spontaneous emission is the random decay of an excited quantum system emitting a photon."}, {"n": "Stimulated emission", "u": "/e/electromagnetism-and-radiation/stimulated-emission/", "s": "Predicted by Einstein; basis of laser and maser."}, {"n": "Synchrotron radiation", "u": "/e/electromagnetism-and-radiation/synchrotron-radiation/", "s": "Radiation from relativistic charged particles accelerated perpendicular to velocity."}, {"n": "Terahertz radiation", "u": "/e/electromagnetism-and-radiation/terahertz-radiation/", "s": "Electromagnetic radiation bridging microwaves and infrared, with limited atmospheric range."}, {"n": "Ultraviolet", "u": "/e/electromagnetism-and-radiation/ultraviolet/", "s": "Electromagnetic radiation beyond violet, with both harmful and beneficial effects."}, {"n": "Visible spectrum", "u": "/e/electromagnetism-and-radiation/visible-spectrum/", "s": "The range of electromagnetic radiation visible to the human eye."}, {"n": "Waveguide (radio frequency)", "u": "/e/electromagnetism-and-radiation/waveguide-radio-frequency/", "s": "Hollow metal pipe guiding microwave radio waves."}, {"n": "Vacuum permeability", "u": "/e/electromagnetism-and-radiation/vacuum-permeability/", "s": "Physical constant quantifying magnetic field strength induced by electric current in vacuum."}, {"n": "Vacuum permittivity", "u": "/e/electromagnetism-and-radiation/vacuum-permittivity/", "s": "Fundamental constant quantifying vacuum's response to electric fields."}, {"n": "Voltage", "u": "/e/electromagnetism-and-radiation/voltage/", "s": "Voltage is the electric potential difference between two points."}, {"n": "Magnetic resonance", "u": "/e/electromagnetism-and-radiation/magnetic-resonance/", "s": "A magnetism-based resonance process enabling imaging and spectroscopy."}, {"n": "Radio frequency", "u": "/e/electromagnetism-and-radiation/radio-frequency/", "s": "Oscillation rate enabling radio wave radiation and technology."}, {"n": "Relativistic Doppler effect", "u": "/e/electromagnetism-and-radiation/relativistic-doppler-effect/", "s": "Relativistic modification of Doppler shift using special relativity."}, {"n": "Synchrotron", "u": "/e/electromagnetism-and-radiation/synchrotron/", "s": "Cyclic accelerator with synchronized magnetic field and particle energy."}]