**1.**

The electric field is a function of x and t.

At x = 0,

The simplest form of a traveling electromagnetic wave is a plane wave. For a wave traveling in the x direction whose electric field is in the y direction, the electric and magnetic fields are given by the picture shown above. This wave is linearly polarized in the y direction.

1. What is the mathematical expression for the electric field at the point x=0, y= 0, z at time t?

2. For a given wave, what are the physical variables to which the wave responds?

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