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Maxwell's equations predict electromagnetic waves in free space with a speed equal to

  • A.the reciprocal of the square root of the product of the two free space constants
  • B.the ratio of the permeability to the permittivity of free space
  • C.the product of the permeability and the permittivity of free space
  • D.the square root of the ratio of the two free space constants

Answer: A

Substituting the measured values gives very nearly three times ten to the eighth metres per second, and the agreement with the measured speed of light was Maxwell's decisive argument that light is an electromagnetic wave. The other combination gives the impedance of free space.

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