Muons are produced high above the earth (typically 20 km) from
energetic
protons in cosmic rays impacting on nuclei of atoms in our
atmosphere. After
these collisions the muons are typically travelling at 0.999 times
the speed of light.
The half life for muons is 1.5 μs. What fraction of muons would be
observed at
sea-level (i) according to Newton (ii) according to Einstein?
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