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<ol><li>A high energy cosmic ray hits the upper atmosphere, 10km above the earth, and produces a muon

travelling and 0.99c. (3 points)</li><li>(a) How long does it take the muon to hit the earth's surface in the earth's reference frame?</li><li>(b) How long does it take to hit the surface in the muon's reference frame?</li><li>(c) If the mean lifetime of a muon is 2.2μs what is the chance that it will reach the earth's surface?</li></ol>

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