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# Question: one of the most impressive experimental confirmations of time dilation...

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One of the most impressive experimental confirmations of Time Dilation involves muons. Muons are unstable elementary particles with a lifetime of 2.2 μμs. They are naturally produced in collisions between cosmic radiation and atoms in our upper atmosphere (~3000m above the Earth's surface). A muon travels at 0.98c. In a reference frame that is attached to the moving muon (the muon's reference frame), how far can the muon travel before it decays (recall that v = d/t)?

For an observer at rest on the Earth, what does he measure for the lifetime of the muon (in seconds)?

For an observer at rest on the Earth, how far does the muon travel before it decays?