Question

a solution made from betacarotene is orange in color. what wavelength range is appropriate to use for spectroscopic analysis?
600-640 nm
640-700 nm
450-480 nm
560-600 nm

Explanation:

Step1: Recall color absorption principle

The color a substance appears is the complementary color of the light it absorbs. Orange is complementary to blue-blue-green.

Step2: Match complementary color to wavelength

Blue-blue-green corresponds to the 450-480 nm wavelength range.

Answer:

450 - 480 nm