What would the electric field look like in a system with two parallel positively charged planes with equal charge densities?

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The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?