| Relativistic Particle |
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| quantum mechanics | |
| special relativity | |
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Massless particles (e.g., Photons ) are always moving at the speed of light, therefore they are always relativistic. Massive particles are relativistic when their Kinetic Energy is comparable or greater than the energy corresponding to their Rest Mass . (This condition implies that their Speed is close to the Speed Of Light .) Such relativistic particles are generated in Particle Accelerator s, and are naturally occurring in Cosmic Radiation . In Astrophysics , Jets of Relativistic Plasma are produced by the centers of Active Galaxies and Quasar s. A charged relativistic particle crossing the interface of two media with different Dielectric Constant s emits Transition Radiation . This is exploited in the Transition Radiation Detector s of high-velocity particles. See also:
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