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A muon is an unstable particle whose mean lifetime is 2.2 ∙ 10-6 s as measured...

A muon is an unstable particle whose mean lifetime is 2.2 ∙ 10-6 s as measured by an observer at rest relative to the muon. A large burst of such muons is produced 6.0 km above the ground level, after which the muons move towards the surface of the Earth with a velocity 0.92?. a) What is the mean lifetime of the muons to a stationary observer on the surface of the Earth? b) What percentage of the muons reach the surface of the Earth?

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