As rainbows fade, it seems the purple and blue edge always fades first, and is the last to appear.
2006-09-04 10:22:26 · 5 answers · asked by Nightwalker 3 in Science & Mathematics ➔ Earth Sciences & Geology
I think it's because red/orange/yellow light has a longer wavelength than blue/indigo/violet. Longer wavelength means it can travel farther without dissipating, so you can see it from farther away. This is the same reason why fire engines are red or yellow, and traffic lights use the colors they do.
2006-09-04 10:46:34 · answer #1 · answered by Danzarth 4 · 0⤊ 0⤋
It might be because the purple and blue portion of the rainbow have less contrast with the naturally blue sky. As a result, when the rainbow is fainter, those colors can barely be seen at all.
2006-09-04 17:31:15 · answer #2 · answered by DavidK93 7 · 0⤊ 0⤋
the colors are so much like the sky. that's why it appears to be the last to appear and the first to disappear
2006-09-05 09:03:17 · answer #3 · answered by babybro35 6 · 0⤊ 0⤋
I would guess because those color frequencies start to blend in with the color of the sky, which isn't really a color, but it is as perceived by our brains :)
2006-09-04 17:27:24 · answer #4 · answered by Life after 45 6 · 1⤊ 0⤋
because the light is getting closer to the ultra violet light and other spectrums we cannot see.
2006-09-04 17:28:54 · answer #5 · answered by saru 2 · 0⤊ 0⤋