5. A uniform electromagnetic plane wave is traveling in free space and its electric field is given by E = 5cos(ωt-2z)ax V/m, what is the angular frequency, ω in (rad/s), of the plane wave?
(A)3✖10⁸
(B)6✖10⁸
(C)6✖10⁹
(D)6.28✖10⁸

(E)None of the above

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統計： 尚無統計資料

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