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The intrinsic impedance of a medium is the ratio of

  • A.the phase velocity to the wavelength in the medium
  • B.the attenuation constant to the phase constant
  • C.the electric to the magnetic field magnitude in a plane wave
  • D.the permittivity to the permeability of the medium

Answer: C

It is \( \sqrt{\mu/\epsilon} \) for a lossless medium, about 377 ohms in free space, and it governs how much of a wave is reflected at a boundary. Being a ratio of a volt per metre to an ampere per metre, it has the dimensions of a resistance.

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