Two π+ mesons are created. One is created at rest in the laboratory, and one moving at v = (4/5)c. c is the speed of light. Both decay in 2 x 10-9 s in their own rest frames. What is the lifetime of the moving pion as measured in the lab, compared to the lifetime of the pion at rest in thar lab as measured in the reference frame of the moving pion?

Two π+ mesons are created. One is created at rest in the laboratory, and one moving at v = (4/5)c. c is the speed of light. Both decay in 2 x 10-9 s in their own rest frames. What is the lifetime of the moving pion as measured in the lab, compared to the lifetime of the pion at rest in thar lab as measured in the reference frame of the moving pion?

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