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

Published by Pearson

# Chapter 20 - Traveling Waves - Exercises and Problems - Page 589: 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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