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2. The average lifetime of a muon is about 2 µs.
a) Estimate the average lifetime of a muon traveling at the speed of (i) 0.5 c, (ii) 0.9 c,
(iii) 0.99 c.
b) In a laboratory experiment, a muon is observed to travel a distance of 800 m before
disintegrating. Estimate the speed of this muon in the laboratory frame.

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