Answer
$$5.0 \mathrm{cm} / \mathrm{s}$$
Work Step by Step
The frequency is $$f=1 / T=1 / 4 \mathrm{Hz},$$ so $$v=f \lambda=5.0 \mathrm{cm} / \mathrm{s}$$
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 - Problems - Page 478: 90a
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