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: 69

Answer

It costs energy.

Work Step by Step

This is shown in Figure 34.16. Fusing nuclei heavier than iron costs energy. The mass of the product is greater than the total mass of the nuclei that are fused. The "extra" mass comes from the energy input.
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