Conceptual Physics (12th Edition)

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

Chapter 32 - Think and Explain: 23

Answer

See below.

Work Step by Step

Nearly all the alpha particles made it through with little deflection, indicating that the nucleus is mostly empty space. A very small fraction of the positively-charged alpha particles were deflected (scattered) through a large angle, almost straight backward, with little change in speed. This indicates that the positive charge inside the atom must be concentrated in a small central region, the nucleus, which contains most of the atom’s mass. This is discussed on pages 603-604.
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