College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 29 - Multiple-Choice Questions - Page 1116: 8


The correct answer is: (b) an electron

Work Step by Step

The upper number is the total number of nucleons (neutrons and protons), while the bottom number is the number of protons. If $^{215}_{83}Bi$ decays into $^{215}_{84}Po$, then a neutron must have decayed into a proton. In this kind of decay, an electron is also released. We can see that the release of an electron conserves the charge. The correct answer is: (b) an electron
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