Conceptual Physics (12th Edition)

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

Chapter 35 - Think and Discuss: 95

Answer

No, the system mass stays the same.

Work Step by Step

The mass of the radioactive chunk decreases as it loses energy. The energy of the thick lead container increases by the same amount, so its mass increases by the same minuscule amount. No net mass change results. Energy has moved within the system, but stayed the same, and so has the mass.
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