Answer
$7$
Work Step by Step
We can find the required degrees of freedom as follows:
$\gamma=1+\frac{2}{f}$
This can be rearranged as
$f=\frac{2}{\gamma-1}$
$\implies f=\frac{2}{1.29-1}$
$\implies f=7$
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0321740904
ISBN 13:
978-0-32174-090-8
Chapter 18 - The Micro/Macro Connection - Exercises and Problems - Page 524: 51
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