An electromagnetic wave with frequency 4.00 X 1014 Hz
Chapter 33, Problem 72(choose chapter or problem)
An electromagnetic wave with frequency 4.00 X 1014 Hz travels through vacuum in the positive direction of an x axis. The wave has its electric field directed parallel to the y axis, with amplitude Em. At time t = 0, the electric field at point P on the x axis has a value of + Em 14 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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