Question

A high energy cosmic ray hits the upper atmosphere, 10km above the earth, and produces a muon travelling and 0.99c. (a) How long does it take the muon to hit the earths surface in the earths reference frame? (b) How long does it take to hit the surface in the muons reference frame? (c) If the mean lifetime of a muon is 2.2us what is the chance that it will reach the earths surface?

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=0.7083 km 1- (0.93)% 0.693 x 2.2 x , o 1.529以10Tc

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