Question

If a colored but otherwise clear solution of a soluble compound appears green to our eyes, approximately what wavelength of EM did the compound that the solution contains absorb?

A 575 nm

B 675 nm

C 625 nm

D 525 nm

E 425 nm

Answer 1

Color absorbed        Color seen

Violet            Yellow

Blue            Orange

Green            Red

Yellow            Violet

Orange            Blue

so that,

if green appears, the absorbed color will be red. and its

wavelength = B. 675 nm