Discussion
What does an absorption band's width depend on chiefly?
Answer: A
In solution an electronic transition is accompanied by a range of vibrational and rotational changes and is broadened further by solvent interaction, giving a band tens of nanometres wide. The slit adds instrumental broadening on top, but the underlying width is molecular. Neither concentration nor path length affects the shape, only the height. Distinguishing the natural width of a band from the width an instrument imposes is what decides whether a narrower slit would actually reveal anything more.
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