Conceptual Physics (12th Edition)

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

Chapter 34 - Think and Discuss - Page 655: 70

Answer

It costs energy.

Work Step by Step

This is shown in Figure 34.16. Splitting nuclei lighter than iron costs energy. The total mass of the fission products is greater than the mass of the initial nucleus. The "extra" mass comes from the energy input.
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