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4.4 Muon lifetime. The lifetime of a stationary muon is 2.2 microseconds. A beam of
muons is produced traveling at 83% of the speed of light. How far will the muons travel
before they decay (a) if commonsense ideas of time were correct? (b) in the real world of
relativity? (Measuring this distance is a direct test of time dilation, frequently performed in
undergraduate physics teaching laboratories.)

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