12. (5%) The E-field of a uniform plane wave propagating in a dielectric medium is given by 61e4fb7a8e76e.jpg. Assume this dielectric medium is lossless and non-magnetic (σ =0, μr= 1). Which of the following statements is correct?
(A) The dielectric constantεr of this medium is 4.
(B) This plane wave is linearly polarized.
(C) The wavelength in the dielectric medium is 6 m.
(D) None of the above.

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統計： A(0), B(0), C(1), D(0), E(0) #2853387