Which statement correctly describes the relationship between absorbance and path length in a solution?

The relationship between absorbance and path length in a solution is described by Beer-Lambert Law, which states that absorbance is directly proportional to both the concentration of the absorbing species and the path length through which the light travels. As the path length increases, the amount of light that interacts with the absorbing particles in the solution also increases, leading to a higher absorbance value.

Hence, a longer path length results in an increase in absorbance because more compounds are present along the longer path for the light to interact with, effectively enhancing the overall absorption of light. This principle is fundamental in quantitative analysis using colorimetry and spectrophotometry, where absorbance measurements help to determine concentrations of substances in a sample.