At rest, pions have a proper lifetime of 26 ns. What is the speed of a beam of pions if their observed lifetime were measured to be 64 ns ? This is a real experiment that has been performed and found to be consistent with special relativity.)
A) 0.96c
B) 0.84c
C) 0.70c
D) 0.41c
E) 0.91c

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The Answer of At rest, pions have a proper lifetime of 26 ns. What is the speed of a beam of pions if their observed lifetime were measured to be 64 ns ? This is a real experiment that has been performed and found to be consistent with special relativity.)
A) 0.96c
B) 0.84c
C) 0.70c
D) 0.41c
E) 0.91c

At Rest, Pions Have a Proper Lifetime of 26 Ns