Answer
$I = 3.97\times 10^9~W/m^2$
Work Step by Step
We can find the beam intensity:
$I = \frac{P}{A}$
$I = \frac{P}{\pi~r^2}$
$I = \frac{5.00\times 10^{-3}~W}{(\pi)~(633\times 10^{-9}~m)^2}$
$I = 3.97\times 10^9~W/m^2$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 33 - Electromagnetic Waves - Problems - Page 1002: 30a
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