Discussion
The Beer-Lambert law states that absorbance is proportional to the concentration and the
Answer: B
Correct answer: path length through the sample
The Beer-Lambert law is
\[ A = \varepsilon c l \]so absorbance is proportional to both the concentration and the path length, with the molar absorptivity as the constant of proportionality for that substance at that wavelength. It is not proportional to the incident intensity - that cancels, which is why absorbance is a property of the sample rather than of the lamp.
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