Question

Review The Pi Meson An elementary particle called a pi meson (or pion for short) has an average lifetime of 2.6 x 108 s when at rest. Part A Suppose a pion moves with a speed of 0.92 c relative to a stationary laboratory. If there were NO RELATIVISTIC effects, how far would the pion travel in the laboratory before decaying. Express your answer using two significant figures. Πνα ΑΣφ ? dav Previous Answers Request Answer Submit Incorrect; Try Again; 5 attempts remaining Part B However, because of relativity the pion's lifetime as seen in the laboratory will be longer. By what factor will the lifetime of the pion increase when moving at a speed of 0.92 c. (7) Vα ΑΣφ Request Answer Submit

Answer 1

Distance travelled before decaying dar= 0.92%3x108 x 2.6x15 8 = vxt I dev = 7.2 m) 0. 92 1 -0.8464 ca ca r= 2.6

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