Answer
A helium atom has less mass than the sum of the 2 hydrogen nuclei that fused to form it. The "missing mass" was converted into the energy released by the fusion reaction.
Work Step by Step
This is discussed on page 649.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 34 - Reading Check Questions (Comprehension) - Page 653: 26
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