Answer
$1.9\times10^{-15}m$
Work Step by Step
The $\alpha$ particle is a helium nucleus. This has A = 4. Use equation 30–1.
$$r=(1.2\times10^{-15}m)A^{1/3}=(1.2\times10^{-15}m)4^{1/3}=1.9 fm$$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 30 - Nuclear Physics and Radioactivity - Problems - Page 881: 2
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