Answer
$20\pi\;m^{-1}$
Work Step by Step
The wavelength of the wave is given $\lambda=10\;cm=0.1\;m$
Now, the wavenumber $(k)$ is given by
$k=\frac{2\pi}{\lambda}$
or, $k=\frac{2\pi}{0.1}\;m^{-1}$
or, $k=20\pi\;m^{-1}$
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 476: 62b
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