Answer Bank

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It holds the sample and has a defined pathlength.

It provides electromagnetic radiation in the ultraviolet $($UV$),$ visible, or infrared $($IR$)$ region of the spectrum.

It is typically a grating, prism, or filter that selects a narrow wavelength band of radiation and passes it to the sample.

It is typically a photomultiplier tube that generates an electric signal when struck by photons.