Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 20 - Traveling Waves - Exercises and Problems: 21

Answer

(a) $f = 1.5\times 10^{9}~Hz$ (b) $\lambda = 1.0\times 10^{-6}~m$

Work Step by Step

(a) We can find the frequency of an electromagnetic wave with a wavelength of 20 cm. $f = \frac{v}{\lambda}$ $f = \frac{3.0\times 10^8~m/s}{0.20~m}$ $f = 1.5\times 10^{9}~Hz$ (b) We can find the wavelength of a sound wave in water which has this frequency. $\lambda = \frac{v}{f}$ $\lambda = \frac{1500~m/s}{1.5\times 10^{9}~Hz}$ $\lambda = 1.0\times 10^{-6}~m$
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