In a high-energy collision between a cosmic-ray particle and a particle near the top of Earth's...

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Physics

In a high-energy collision between a cosmic-ray particle and aparticle near the top of Earth's atmosphere, 104 km above sealevel, a pion is created.The pion has a total energy E of 1.92 ×105 MeV and is traveling vertically downward. In thepion's rest frame, the pion decays 35.0 ns after its creation. Atwhat altitude above sea level, as measured from Earth's referenceframe, does the decay occur? The rest energy of a pion is 139.6MeV.

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Total energy is given bywhere In its rest frame pion decays in time In Earths frame pion is    See Answer
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