What color would the sky be if air molecules selectively scattered only the longest wavelengths of visible light?
A) white
B) blue
C) red
D) black

Question

Quizplus · Accepted Answer

The longest wavelengths of visible light are the red end of the spectrum. If only these wavelengths were scattered, the sky would appear red. This actually happens during sunrises and sunsets when the sun is low on the horizon, as the light has to travel through more of the Earth's atmosphere, causing the shorter blue wavelengths to scatter and leaving the longer red wavelengths to dominate the sky.

What Color Would the Sky Be If Air Molecules Selectively