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The frequency of a wave is determined by

  • A.the permittivity and permeability of the medium it travels through
  • B.the wavelength together with the intrinsic impedance of the medium
  • C.the attenuation constant of the medium at that particular frequency
  • D.the source

Answer: D

Nothing along the path can change how often the field reverses, so the frequency is carried unchanged from medium to medium. The wavelength and the velocity both adjust to the medium, which is the whole content of refraction.

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