An unstable particle called the pion has a mean lifetime of, Ask an Expert

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An unstable particle called the pion has a mean lifetime of 25 ns in its own rest frame. A beam of pions travels through the laboratory at a speed of 0.581c.

(a) What is the mean lifetime of the pions as measured in the laboratory frame?

(b) How far does a pion travel in meters (as measured by laboratory observers) during this time?

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