Answer
$\lambda=16.8m$
Work Step by Step
We can find the longest possible wavelength as:
$L=\frac{\lambda}{2}$
Rearranging the formula to find $\lambda$ and then substituting the value of $L$, we find that;
$\lambda=2L=2(8.40)=16.8m$
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 474: 41b
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