Discussion
The monochromator in a spectrophotometer serves to
Answer: C
Correct answer: select a narrow band of wavelengths
The monochromator - a prism or, now, a diffraction grating with entrance and exit slits - disperses the light and passes only a narrow band to the sample or detector. Its bandwidth matters: too wide a band violates the monochromatic assumption behind Beer’s law and flattens sharp peaks. The detector converts light to signal, and the amplification and temperature control are separate functions.
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