6. (a) A neutron 5000 light-years from earth has rest mass 940 MeV and a half life of 13 minutes….

6. (a) A neutron 5000 light-years from earth has rest mass 940 MeV and a half life of 13 minutes. How much energy must it have to reach the earth at the end of one half life? (b) In the spontaneous decay of _+  mesons at rest, _+  _ _+  + __ , the _+  mesons are observed to have a kinetic energy of 4.0 MeV. The rest mass of the _+  is 106 MeV. The rest mass of neutrino is zero. What is the rest mass of _+?

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