Question

which object reflects light with the longest wavelength?
a yellow book
a violet flower
a blue paper
a green leaf

Explanation:

In the visible - light spectrum, red has the longest wavelength and violet has the shortest. Yellow is closer to red compared to violet, blue, and green in the spectrum. So an object that reflects yellow light is likely to reflect light with a relatively long wavelength among the given options.

Answer:

a yellow book