An unstable high-energy particle enters a detector and leaves a track of length 1.05 mm before it

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An unstable high-energy particle enters a detector and leaves a track of length 1.05 mm before it decays. Its speed relative to the detector was 0.992c.What is its proper lifetime? That is, how long would the particle have lasted before decay had it been at rest with respect to the detector?

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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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