Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 34 - Think and Explain: 51

Answer

The mass of an atomic nucleus is less than the sum of the masses of the component nucleons that make it up.

Work Step by Step

Work must be done (i.e., energy must be added) to separate a nucleus into its nucleons. According to $E = mc^{2}$, this adds mass to the system. The separated nucleons are more massive than the original nucleus.
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