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    Electrons, Protons, Neutrons - Build-stones?

    All matter is made up of smaller building blocks (until you get down to the fundamental (as far as we know) level of quarks, leptons and bosons). The elementary particles build into hadrons such as protons and neutrons, which build into atoms, which build into the matter you see around you...
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    Why is it that lower frequency EM waves are aloud to pass through objects, but high

    Radio waves (low f) pass through walls that visible light doesn't. But x-rays (high f) also pass through things visible light doesn't. So frequency isn't the determining factor here perhaps?