As discussed in section R3.4, muons created in the upper atmosphere can sometimes reach the earth’s surface. Imagine that one such muon travels the 60 km from the upper atmosphere to the ground (in the earth’s frame) in one muon half-life of 1.52 us (in the muon’s frame). How thick is the portion of the earth’s atmosphere from the muon’s creation point to the ground in the muon’s frame?

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As discussed in section R3.4, muons created in the upper atmosphere can sometimes reach the earth’s surface. Imagine that one such muon travels the 60 km from the upper atmosphere to the ground (in the earth’s frame) in one muon half-life of 1.52 us (in the muon’s frame). How thick is the portion of the earth’s atmosphere from the muon’s creation point to the ground in the muon’s frame?

 

The book key gives an answer of 460 m.  I'm having a hard time getting this result.

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