University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 43 - Nuclear Physics - Problems - Discussion Questions - Page 1474: Q43.11

Answer

They are smaller and have less mass.

Work Step by Step

With the same energy, a $\beta$ particle moves much faster than an $\alpha$ particle, and it is also smaller. That gives it more penetrating power.
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