After being produced in a collision between elementary particles, a positive pion (π+) must travel down a 1.30 km -long tube to reach an experimental area. A π+ particle has an average lifetime (measured in its rest frame) of 2.60×10−8s; the π+ we are considering has this lifetime.(adsbygoogle = window.adsbygoogle || []).push({});

How fast must the π+ travel if it is not to decay before it reaches the end of the tube? (Since u will be very close to c, write u=(1−Δ)c and give your answer in terms of Δrather than u.)

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# I Lorentz's Equations

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