After being produced in a collision between elementary

Chapter 37, Problem 37.49

(choose chapter or problem)

After being produced in a collision between elementary particles, a positive pion must travel down a 1.90-km-long tube to reach an experimental area. A particle has an average lifetime (measured in its rest frame) of the we are considering has this lifetime. (a) How fast must the travel if it is not to decay before it reaches the end of the tube? (Since will be very close to write and give your answer in terms of rather than ) (b) The has a rest energy of What is the total energy of the at the speed calculated in part (a)?

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