National League for Nursing (NLN PAX) Practice Exam 2025 – All-in-One Resource to Excel in Your Nursing Admission Test!

When light passes through a dilute chlorophyll solution, the absorption properties of chlorophyll need to be considered. Chlorophyll primarily absorbs light in the blue (around 430 nm) and red (around 662 nm) wavelengths of the spectrum for use in photosynthesis. This means that red light, which is necessary for photosynthesis, is largely absorbed by the chlorophyll.

Given that the solution is dilute, it will not absorb all of the incident light; rather, it will allow some light to transmit through. Typically, a significant portion of red light is absorbed, but enough will still be transmitted through the solution to yield a detectable amount. This leads to a transmittance value that falls within a range of 50-75%.

Thus, when a red light is passed through a dilute chlorophyll solution, the outcome is that transmittance is less than 100% due to the absorption by chlorophyll, but still substantial enough to yield a detectable amount, resulting in transmittance that aligns with the range specified in the selected answer.