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Homework Help: Relativity - pion

  1. Feb 15, 2017 #1
    1. The problem statement, all variables and given/known data
    After being produced in a collision between elementary particles, a positive pion must travel down a 1.00 km long tube to reach an experimental area. A positive pion has an average lifetime of to = 2.60*10^(-8)s; the pion we are considering has this lifetime. How fast must the pion 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 Δ rather than u.)

    2. Relevant equations
    Δt = Δto/(1 - u^2/c^2)^(1/2)

    3. The attempt at a solution
    I don't really know where I'm going with this?
  2. jcsd
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