refer to the following: An electric eld E of a wave with

Chapter 7, Problem 68

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refer to the following: An electric eld E of a wave with constant amplitude A, propagating a distance z, is given bywhere k is the propagation wave number, which is related to the wavelength by and where is the speed of light in a vacuum, and t is time in seconds. Electromagnetic Wave Propagation. Use the cosine difference identity to express the electric eld in terms of both sine and cosine functions. When , what do you notice?

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