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The scattered blue-rich light is the blue sky, and the unscattered
red-rich light is the red sunset.
Imagine that you're an air molecule and an EM wave comes by, with a<snip>
frequency that's too low to excite your electrons into excited
states. ... your electrons (and nuclei), being
accelerated charged particles, are going to emit their own EM
wave (dipole radiation). The rate at which they emit energy is
proportional to their acceleration squared