College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 15 - Electric Charge, Forces, and Fields - Learning Path Questions and Exercises - Exercises - Page 556: 3


a). $6.4\times10^{-19}C$ b). 2 electrons

Work Step by Step

a). 1 alpha particle has 2 protons, 2 alpha particles will have 4 protons. The charge on 1 proton = $1.6\times10^{-19}C$ The charge on 4 protons will be = $4\times1.6\times10^{-19}C=6.4\times10^{-19}C$ b). 1 alpha particle has 2 protons. The atoms are electrically neutral and thus to neutralize the charge of 2 protons, 2 electrons will be needed. The alpha particle will have to accommodate 2 electrons to become a Helium atom.
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