Relativity is a fundamental concept in physics that describes how the laws of physics remain the same for all observers, regardless of their relative motion. This principle is crucial when dealing with high-speed particles and their behavior, particularly when examining the effects of speed on time, space, and mass. In the context of quantum mechanics, relativity is significant as it challenges classical notions and leads to the formulation of equations like the Klein-Gordon equation, which describes spinless particles in a relativistic framework.
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