As a result of the collisions of cosmic rays with atoms in the upper atmosphere, muon particles are produced kilometers above the Earth's surface. The muon is an unstable particle with a half-life of 1.5 µs. In an experiment, a measurement is made with a muon detector in a balloon 2000 m above the ground, and 650 muons are observed in 1 hour, each of which has a speed of 0.99c in the direction of the Earth. How many of these muons are observed in 1 hour at sea level? (Use No/2^n muons left at the end of the half-life from the No number of muons at the beginning. )

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special relativity

As a result of the collisions of cosmic rays with atoms in the upper atmosphere, muon particles are produced kilometers above the Earth's surface. The muon is an unstable particle with a half-life of 1.5 µs. In an experiment, a measurement is made with a muon detector in a balloon 2000 m above the ground, and 650 muons are observed in 1 hour, each of which has a speed of 0.99c in the direction of the Earth. How many of these muons are observed in 1 hour at sea level? (Use No/2^n muons left at the end of the half-life from the No number of muons at the beginning. )

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