If there are muons at time , then at some later time , there would be
So, at time , the muons decay at a rate So, in a time interval , muons decay. So, the probability that a muon decays in this time interval is A muon that travels a distance in the laboratory will decay at time in its rest frame. So, . So, the probability that a muon decays after traveling a distance is The mean distance traveled by the muons is therefore, Plugging in and gives Therefore, answer (C) is correct. |

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