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At time t=0s, there are No unstable pions. What fraction of pions decay after
travelling a distance of 25 m? Assume the pions travelling at 0.86c and their average
lifetime is 20.0 ns.
Select the correct answer choice:
(a)
85.9%
(b) 91.6%
(c) 99.2%
(d) 89.2%

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