Testing Relativity. A π+ meson produced at rest has a lifetime of 18 nanoseconds (1.8 × 10−8 s). Thus, in its own reference frame, a π+ meson will always “think” it is at rest and therefore will decay after 18 nanoseconds. Suppose a π+ meson is produced in a particle accelerator at a speed of 0.998c. How long will scientists see the particle last before it decays? Briefly explain how an experiment like this helps verify the

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