What happens to red light transmission as glucose concentration increases in a sample?

As glucose concentration increases in a sample, the phenomenon observed in terms of light transmission, specifically for red light, is that it decreases. This occurs because higher concentrations of glucose lead to increased turbidity or scattering of light due to the interaction of glucose molecules with light. Essentially, as more glucose is present, it absorbs and scatters light more effectively, resulting in diminished transmission of red light through the sample.

The reasoning behind this is tied to the principles of light interaction with solutions. Substance concentrations can affect how much light is absorbed or transmitted. In this case, as glucose concentrations increase, the amount of red light that can pass through the sample is reduced. This is critical for applications such as spectrophotometry, where the amount of light transmitted can be correlated with the concentration of a substance in solution.

Therefore, when considering the choices, the correct conclusion is that more glucose results in lower red light transmission, which aligns with the principles of light absorption and transmission in solution.