Final answer:
The appropriate LED colors and wavelength ranges to measure the absorbance of red, blue, and yellow dye solutions are a green LED (500-550 nm) for red dye, a blue LED (450-500 nm) for yellow dye, and a yellow LED (550-600 nm) for blue dye, because dyes absorb their complementary colors.
Step-by-step explanation:
To measure the absorbance of red, blue, and yellow dye solutions, you would want to use an LED light that is the complementary color of the dye being tested, because complementary colors are absorbed by the substance.
Given the information that absorption of 420-430 nm light renders a substance yellow, and absorption of 500-520 nm light makes it red; and knowing that green can be made by absorbing light close to both 400 nm and 800 nm, we can deduce the following:
- For red dye, which absorbs in the green wavelength range (400-500 nm), the appropriate LED color would be a green LED, ranging from 500-550 nm (Option D).
- For blue dye, with complementary color yellow, the appropriate LED color is a yellow LED, ranging from 550-600 nm (Option C).
- For yellow dye, which absorbs light around 420-430 nm (violet range), the correct LED light would be a blue LED, ranging from 450-500 nm (Option B).
Therefore, the appropriate LED color and wavelength range to measure the absorbance of red, blue, and yellow dye solutions is a green LED for red dye, a blue LED for yellow dye, and a yellow LED for blue dye.