Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 25 - Electromagnetic Waves - Problems and Conceptual Exercises - Page 902: 43

Answer

(a) factor of 2 (b) factor of 4

Work Step by Step

(a) We know that the electric and magnetic fields in an electromagnetic field are directly proportional. Thus, if the rms value of the electric field is doubled, then the rms value of the magnetic field will also be doubled. (b) The intensity of an electromagnetic wave depends on the square of the electric and magnetic fields. Thus, if electric and magnetic fields are doubled then the intensity will increase by a factor of 4.
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