Word Count : 348

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We are given the electric field of an electromagnetic wave in vacuum as: $$ \mathbf{E} = (800\, \text{V/m})\, \hat{\mathbf{x}} \, \sin(2\pi \times 10^8\, t + kz) $$ --- ### Step 1: Compare with standard form of EM wave The general expression for the electric field of a plane electromagnetic wave in vacuum is: $$ \mathbf{E} = E_0\, \hat{e}_E \, \sin(\omega t - kz + \phi) $$ From the given equation: * $E_0 = 800\, \text{V/m}$ * The sine term is $\sin(2\pi \times 10^8\, t + kz)$ So: _____ ____ ________ ________ ____ _____ ______ ________ _________.
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