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Wavenumber, the unit used in infrared spectroscopy, is

  • A.the reciprocal of the wavelength
  • B.the reciprocal of the frequency
  • C.the product of frequency and wavelength
  • D.the wavelength expressed in micrometres

Answer: A

Expressed in reciprocal centimetres, it is directly proportional to energy, which makes it more convenient than wavelength for reading a spectrum. The useful infrared range runs from about 4000 down to 400 reciprocal centimetres.

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