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OpenStudy (anonymous):

The mean lifetime of stationary muons is measured to be 2.2000 us. The mean lifetime of high-speed muons in a burst of cosmic rays observed from Earth is measured to be 16.000 us. To five significant figures, what is the speed parameter B of these cosmic-ray muons relative to Earth?

OpenStudy (anonymous):

the speed lparameter would be the speed?? from the time relation of T=gamma*To

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