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A diode array instrument differs from a scanning monochromator instrument in that it

  • A.measures one wavelength at a time in a fixed predetermined sequence
  • B.requires no light source to make a measurement
  • C.cannot be used for reflectance measurement at all
  • D.measures all wavelengths simultaneously rather than in sequence

Answer: D

Simultaneous detection makes the measurement much faster and avoids drift between wavelengths. Resolution and stray light performance may be poorer than a good scanning instrument. Speed is gained at some cost in performance.

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