Answer
$8$ nodes
Work Step by Step
The amount of notes for the $n$th harmonic is always equal to $n+1$. So, for the $7$th harmonic there would be $7+1=8$ nodes.
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 16 - Waves-I - Questions - Page 471: 10a
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