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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