Answered: An electromagnetic wave with frequency…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter34: Maxwell’s Equations And Electromagnetic Waves

Section: Chapter Questions

Problem 32PQ

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Question

An electromagnetic wave with frequency 4.00 *10^14 Hz travels
through vacuum in the positive direction of an x axis. The wave
has its electric field oscillating parallel to the y axis, with an amplitude
Em.At time t= 0, the electric field at point P on the x axis has a
value of +Em/4 and is decreasing with time. What is the distance
along the x axis from point P to the first point with E = 0 if we
search in (a) the negative direction and (b) the positive direction of
the x axis?

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