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 elativity? (Measuring this distance is a direct test of time dilation, frequently performed in undergraduate physics teaching laboratories.)
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