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Why do EM waves with a large wavelength like those in the red range (and radio waves) interact with particles less than those in the blue range?

That is the reason why the sky is blue, is that right?

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    $\begingroup$ You mean "wavelength" where you say "amplitude", right? $\endgroup$
    – DanielSank
    Apr 10 '15 at 0:26
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    $\begingroup$ This is called Rayleigh scattering. $\endgroup$
    – ACuriousMind
    Apr 10 '15 at 0:35
  • $\begingroup$ yeah! wavelength, sorry. $\endgroup$ Apr 10 '15 at 1:45
  • $\begingroup$ See also Why is the sky not purple? as the answers include some nice descriptions of the physics involved. $\endgroup$ Apr 10 '15 at 10:22