Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 16 - Waves-I - Questions - Page 471: 10b

Answer

Antinode.

Work Step by Step

Note that at all odd harmonic numbers, there is an antinode at the midpoint (i.e. there is an antinode at the midpoint of the 1st harmonic). The $7$th harmonic is an odd harmonic, therefore, it can be concluded that the midpoint is an antinode.
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