Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 14 - Exercises and Problems - Page 272: 52


$1.23 \times 10^{-2}$

Work Step by Step

We know that the intensity is given by: $I = \frac{P}{A}=\frac{P}{4\pi r^2} = \frac{50}{4\pi \times (18^2)} = 1.23 \times 10^{-2}$
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