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Wavelength accuracy of a spectrophotometer is verified using

  • A.a source or filter with known sharp spectral features
  • B.the white calibration tile supplied with the instrument
  • C.a black trap placed at the measuring port
  • D.a sample of the material to be measured

Answer: A

Holmium or didymium filters provide sharply defined absorption bands. A wavelength error shifts every reading and corrupts the computed values. Holmium and didymium filters are used for the check. Their absorption bands are sharply defined.

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