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: 1d

Answer

The Lepton number would not be conserved.

Work Step by Step

An electron has a Lepton number of $+1$ A neutrino has a Lepton number of $+1$, so two neutrinos have a total Lepton number of $+2$ Therefore, if an electron decayed into two neutrinos, the Lepton number would not be conserved.
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