The negative pion is an unstable particle with an average


The negative pion is an unstable particle with an average lifetime of 2.1 x 10-8 s (measured in the rest frame of the pion) If the pion is made to travel at very high speed relative to a laboratory, its average lifetime is measured in the laboratory to be 4.50 × 107 s. Obtain the speed of the pion expressed as a fraction of c. Find what distance, as measured in the laboratory, does the pion travel during its average lifetime?

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Physics: The negative pion is an unstable particle with an average
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