December 10, 2012
#1145: Sky Color
[[A woman with a ponytail leans back on her office chair, back to her computer, gesturing as she speaks to a little girl in front of her.]]
Girl: Mommy, why is the sky blue?
Mother: Rayleigh scattering! Short wavelengths get scattered
way
more (proportional to 1
lambda^4). Blue light dominates because it’s so short.
Girl: Oh. So why
isn’t
the sky violet?
Mother: Well, because, uh… …hmm.