Answer
$1.23 \times 10^{-2}$
Work Step by Step
We know that the intensity is given by:
$I = \frac{P}{A}=\frac{P}{4\pi r^2} = \frac{50}{4\pi \times (18^2)} = 1.23 \times 10^{-2}$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 14 - Exercises and Problems - Page 263: 50
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