An unstable high-energy particle enters a detector and leaves a track 1.15 mm long before it decays. Its speed relative

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An Unstable High Energy Particle Enters A Detector And Leaves A Track 1 15 Mm Long Before It Decays Its Speed Relative 1 (12.55 KiB) Viewed 34 times

An unstable high-energy particle enters a detector and leaves a track 1.15 mm long before it decays. Its speed relative to the detector was 0.956c. What is its proper lifetime in seconds? That is, how long would the particle have lasted before decay had it been at rest with respect to the detector? Number i Units Toscibelend Modi