Answer
$n=4$
Work Step by Step
We know that;
$f_n=nf_1$
or $n=\frac{f_n}{f_1}$
We plug in the known values to obtain:
$n=\frac{260}{65}=4$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 17 - Waves-II - Problems - Page 509: 48b
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