Muons have a short average lifespan of 2.2 microseconds (in their rest frame). They are created upon impact of cosmic radiation with the upper atmosphere, and then travel to the surface of the Earth where they could be detected. (a) What is the average life span of muons flying at a velocity of 0.8c, measured by an observer on Earth? (b) How long would it take for a muon moving as fast as light to traverse the 50km between the where it is created and the surface of the Earth?

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