試題詳解

13. In vacuum, an electromagnetic wave traveling along the x axis has an electric field and a magnetic field whose magnitudes depend on x and t as
E(x,t)=E₀sin(kx一ωt),B(x,t)=B₀sin(kx-ωt+Φ),
where E₀ and B₀ are the amplitudes of . Which fact below is correct?
(A)
(B)The directions of  and   are arbitrary once they are perpendicular to x.
(C)Φ=π/2
(D) ωk =c
(E)This is a linearly polarized wave.