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Special relativity

The proper mean lifetime of subnuclear particles called pions is 2.6 × 10 ^-8 seconds. A beam of pions has a speed of 0.72 c in a laboratory.

The speed of light is 2.998 × 10 ^8 m/s.

In the reference frame of the pion, how far does the pion travel in a typical lifetime of 2.6 × 10^ -8 seconds? Answer in units of m.

What is this distance in the laboratory's frame? Answer in units of m.

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