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: 64

Answer

$I = 2.0\times 10^{-5}~W/m^2$

Work Step by Step

The power spreads in all directions from the antenna. We can find the intensity at a point 10 kilometers away as: $I = \frac{P}{A}$ $I = \frac{P}{4\pi~R^2}$ $I = \frac{25,000~W}{(4\pi)(10,000~m)^2}$ $I = 2.0\times 10^{-5}~W/m^2$
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