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Class 12 Sound in Periodic Structures



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The title for this class is not too inviting, yet its contents could be quite entertaining. Did you know why the Mayan pyramid at Chichen Itza is called the singing pyramid? Also, here you may learn that, if setting up loudspeakers for addressing a crowd in an open space, the project may become a victim of comb filtering. But there is more, it is already a familiar story that of electronic active components going from vacuum tubes to micrometer silicon transistors, but capacitors and inductor coils have also disappeared from todays miniaturized electronics, do you know how this happened? Ah, the magic of sound in periodic structures! Yet, the ultimate of these is the atomic crystal lattice, where sound waves turn into sound particles…phonons.
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Audio
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