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Why are some things transparent?

Daniel and Kelly’s Extraordinary Universe

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The Limits of Quantum Mechanical Materials

In a solid, now you have a whole spectrum of energy levels. There's lots of very, very fine gradations allowed there. So materials can absorb low energy electrons because there's a very,very fine mesh of energy levels and so on. But the other side of the coin are materials like insulators. Glass is not a conductor because it has a large gap between these energy levels.

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