The electric field of an electromagnetic wave in a vacuum is E y = (20.0 V/m) cos

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The electric field of an electromagnetic wave in a vacuum is Ey = (20.0 V/m) cos [(6.28 × 108)x - ωt], where x is in m and t is in s. What are the wave’s

(a) Wavelength,

(b) Frequency,

(c) Magnetic field amplitude?

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