Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Explain: 47

Answer

The alpha particle is much more massive.

Work Step by Step

Though the alpha particle has twice the charge, it has over 7000 times the mass (each of the four nucleons has about 1800 times the mass of an electron). For the same KE, the alpha particles are moving much more slowly, so they feel a smaller force and they have a larger mass. They will deflect less than beta particles do.
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