Velocity of Electromagnetic Waves

  title={Velocity of Electromagnetic Waves},
  author={Louis Essen},
  • L. Essen
  • Published 1 May 1947
  • Geology
  • Nature
THE determination of the velocity of light has attracted the attention of many scientific workers and, in spite of the experimental difficulties involved, its value is now known with a probable error of about 5 parts in 105. The velocity of electromagnetic waves, represented in Maxwell's theory by the quantity where µ is the permeability and k the permittivity of the medium, is generally assumed to have the same value as that of light; and although the electrical measurements made so far are… 
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