They're not mutually exclusive, you know.
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It's time someone taught you the meaning of a joke Nate. I mean, you can't physically steal someone's thunder, nor can you put thunder in someone's pocket.
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The whole 'stealing thunder' thing isn't what made your comment patronising. It was that you attempted to correct someone else whilst mocking them. Even if you had had your facts straight it would have been patronising, but the fact that you were full of shit just made it worse.
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Are you sure that's how it works, by that logic wouldn't that mean any material that isn't soundproof is somewhat translucent? That would also mean that radio waves (that can be metres long)can't travel through, well anything.
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As for the first point, I don't know why you mentioned sound; they operate on very different principles. As for light, most materials that we come in contact on a daily basis are dense enough to block all visible light (by which I'm refering to the photons that have wavelengths in a certain spectrum) but would be transparent to gamma rays and x-rays, to a certain depth. I'm working from memories that are a decade old, so excuse a little fuzziness on the details, but I think it has to do with more than just the density though. It also depends on what the material is and what its crystalline structure is.
As for radio waves, they actually do get blocked quite easily. The plus side of long wavelengths is that they bounce easily and spread out quickly (like the light beam from a torch that widens as it is emitted), so if there's a narrow gap for them to enter a building (say, through a window), they'll quickly spread out to fill the whole room.