Discussion
Why does an instrument switch sources partway through a scan?
Answer: B
Deuterium falls away above about 350 nanometres and tungsten is useless below about 320, so a scan crossing that region must change lamps, and a small step in the baseline often appears there. Overheating, detector requirements and dispersion are not the reason. Recognising that a baseline discontinuity near 340 nanometres is a lamp changeover rather than a sample feature saves chasing an artefact that is built into the instrument. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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