Discussion
Which of the following is not the advantage of diode array spectrophotometers ?
Answer: D
A low signal to noise ratio is not an advantage of diode array spectrophotometers.
A low signal-to-noise ratio is a disadvantage in any instrument, because it means the signal is hard to distinguish from noise. A diode array spectrophotometer in fact gives a good signal-to-noise ratio, because it can average many rapid spectra.
Its real advantages are the other three: it measures many wavelengths simultaneously across the whole spectrum, scans in a fraction of a second, and has high wavelength precision because there are no moving parts.
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