Discussion
Which source is used below about 320 nanometres?
Answer: C
A deuterium discharge gives a useful continuum through the ultraviolet where tungsten's output has collapsed. A globar is an infrared source, and a mercury lamp gives lines rather than a continuum, which suits wavelength calibration rather than absorption measurement. That a spectrophotometer needs a continuum, not lines, is what rules out several otherwise bright sources.
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