Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 44 - Quarks, Leptons, and the Big Bang - Questions - Page 1362: 5d

Answer

The Lepton number would not be conserved.

Work Step by Step

A proton has a Lepton number of $0$ A neutron has a Lepton number of $0$ A neutrino has a Lepton number of $+1$ Therefore, if a proton decayed into a neutron and a neutrino, the Lepton number would not be conserved.
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