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A spectrophotometer is an instrument used in scientific analysis that measures how much a chemical substance absorbs (or transmits) at each wavelength of light.
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Photodetector: A device that converts incoming photons into an electrical signal for measurement purposes.
Cuvette: A small tube-like container with straight sides and round or square cross section for holding samples in spectroscopic experiments.
Sample Solution: The mixture containing the compound whose absorption spectrum is being measured.