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Relativistic Particle




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 mc^2 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.

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