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Assertion: the speed of light follows from the two free space constants. Reason: their product's reciprocal square root has the dimensions of a velocity.

  • A.the assertion is false although the reason offered is a true statement in itself
  • B.both the assertion and the reason are true and the reason explains the assertion
  • C.both the assertion and the reason are true but the reason does not explain the assertion
  • D.the assertion is true but the reason given for it is false

Answer: B

The wave equation derived from Maxwell's equations has exactly that combination as its wave speed, and the dimensional check confirms it can be one. Substituting the measured values gives the measured speed of light, which was Maxwell's great result.

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