A Pion Has a Mean Lifetime of 25 Ns in Its

question 23

Multiple Choice

A pion has a mean lifetime of 25 ns in its own rest frame. A beam of pions traveling through the laboratory at a speed of 0.60 c is measured to have a mean lifetime of

• A) 21 µs.
• B) 20 ns.
• C) 31 ns.
• D) 31 µs.

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