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The distance between adjacent nodes of a standing wave is

  • A.half a wavelength
  • B.one wavelength
  • C.a quarter of a wavelength
  • D.two wavelengths

Answer: A

The pattern repeats every half wavelength, so nodes and antinodes alternate at quarter-wavelength intervals. Measuring the node spacing on a slotted line is the classical way of determining the wavelength and hence the frequency.

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