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Transition radiation
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<p>Transition radiation (TR) is a form of <a href="/facts/Electromagnetic_radiation/Ynx7ujCW">electromagnetic radiation</a> emitted when a <a href="/facts/Charged_particle/2zqBJGse">charged particle</a> passes through <a href="/facts/Homogeneity_and_heterogeneity/y84KQJxl">inhomogeneous</a> media, such as a boundary between two different media. This is in contrast to <a href="/facts/Cherenkov_radiation/lSPJAC3U">Cherenkov radiation</a>, which occurs when a charged particle passes through a <a href="/facts/Homogeneity_and_heterogeneity/y84KQJxl">homogeneous</a> <a href="/facts/Dielectric/PnVt9P2G">dielectric</a> medium at a speed greater than the <a href="/facts/Phase_velocity/m43q3X33">phase velocity</a> of <a href="/facts/Electromagnetic_wave/Ynx7ujCW">electromagnetic waves</a> in that medium. </p>