Observations of neutrinos emitted by the supernova SN1987a (Figure b) place an upper limit of 20 eV

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Observations of neutrinos emitted by the supernova SN1987a (Figure b) place an upper limit of 20 eV on the rest energy of the electron neutrino. If the rest energy of the electron neutrino were, in fact, 20 MeV, what would be the speed difference between light and a 1.5 MeV electron neutrino?

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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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