Discussion
A double beam spectrophotometer improves on a single beam instrument by
Answer: D
Correct answer: compensating for source and detector drift
A double beam instrument splits the light between the sample and a reference and compares them continuously, so any drift in lamp output or detector response affects both alike and cancels in the ratio. A single beam instrument must be re-zeroed against a blank at each wavelength and is vulnerable to drift between that and the measurement. Both use a monochromator and both may report either quantity.
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