Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 14 - Exercises and Problems - Page 263: 52


a) $6366 \ W/m^2$ b) $4.9 \ W/m^2$

Work Step by Step

We use the equation for intensity to find: a) $ I = \frac{5\times10^{-3}}{\pi\times(5\times10^{-4})^2}=6366 \ W/m^2$ b) $ I = \frac{5\times10^{-3}}{\pi\times(1.8\times10^{-2})^2}=4.9 \ W/m^2$
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