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The reflection coefficient of a boundary can be measured from a standing wave pattern by observing

  • A.the phase velocity of the wave in the medium
  • B.the ratio of the maximum to the minimum amplitude
  • C.the spacing of the nodes along the line
  • D.the total power delivered to the boundary

Answer: B

The standing wave ratio follows directly from the two amplitudes, and the magnitude of the reflection coefficient follows from it. The position of the first minimum relative to the boundary then gives the phase of the coefficient, completing the measurement.

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