Discussion
What are the four main parts of a spectrophotometer?
Answer: A
The chain runs from a source of light, through a device that selects a wavelength, through the sample, to a detector that measures what emerges. Amplifiers, recorders and choppers are real components but they support these four rather than replacing them. Reading an instrument as a chain of four functions, each of which can fail in its own way, is what makes a fault traceable rather than mysterious.
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