At Rest,pions Have a Proper Lifetime of 26 Ns

question 44

Multiple Choice

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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