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Joined: Jul 2000
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Carpal Tunnel
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Carpal Tunnel
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themilum: You may be smart, but on this one I suspect you are incorrect. Waves of mechanical energy move more quickly through denser material as a general rule. Sound travels faster underwater than it does through the air, by a considerable margin: "Therefore, the speed of sound is about four times faster in water than in air." http://hypertextbook.com/facts/2000/NickyDu.shtmlFrom the same source "The speed of sound in a medium can be determined by the equation... v = (B/ñ)1/2 (this 1/2 is in the original text an exponent, meaning that the velocity of sound is the square root of the ratio B/ñ) Where... v is the speed of sound, B is the bulk modulus of elasticity, and ñ (rho) is the density. The bulk modulus of elasticity, also known as the compressibility, is the relationship between pressure and volume. It is a measure of how much an increase in pressure would decrease the volume." It's my understanding that the nature of a seismic wave is sound, that is a longitudinal mechanical wave of energy. The Earth rings "like a bell" when there is seismic activity. Whether the waves of sound move more slowly through the iron core of the earth is basically a matter of the elasticity or lack thereof of the iron core. Take as an example a ball made of rubber. If you hit it (make a sound) on one side, the elasticity is such that it deadens the sound (which is the same thing as saying that the speed of sound in the medium rubber is slowed to zero.) Not the same when you strike the side of an iron ball. My guess is that the bulk modulus of the iron core of the earth is really high, because it is already compressed greatly. Any sound hitting it is going to go right through (and very quickly) because the iron cannot further compress. TEd
TEd
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Joined: Sep 2000
Posts: 4,757
Carpal Tunnel
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Carpal Tunnel
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Is anyone else able to get that page up today? It gives me just an error message now; did the site encounter a virtual tsunam-e?
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Joined: Jun 2002
Posts: 7,210
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2002
Posts: 7,210 |
loaded fine for me, but I noticed that he's getting hit pretty hard. 88,000 hits yesterday. 210,000 today...
formerly known as etaoin...
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Joined: May 2002
Posts: 1,529
veteran
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veteran
Joined: May 2002
Posts: 1,529 |
I got it up clean, Maverick. Be sure you remember to click on of troy and not wow, for best results. ------------------------------------------------- Well kick my shin and call me shiny, TEd, of course you are right! Heat slows, and rigity accelerates, wave speed. And even though the larger part of the core is liquid and wave speed dissipates with dispersal, overall speeds are higher as they go through the rigid core. So what, you say? And so what, you'd be right! I take back that part about me being smart, Wordwind. And here's a URL with relative wave speeds as they go through the core. http:// http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/waves_and_interior.html
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Joined: Sep 2000
Posts: 4,757
Carpal Tunnel
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Carpal Tunnel
Joined: Sep 2000
Posts: 4,757 |
> remember to click on of troy
Allus did :)
Thanks, yes, loading OK now so I guess the site was just overwhelmed at first try earlier.
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Joined: Dec 2000
Posts: 13,803
Carpal Tunnel
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Carpal Tunnel
Joined: Dec 2000
Posts: 13,803 |
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Joined: Jun 2002
Posts: 7,210
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2002
Posts: 7,210 |
nice. it's like all the crime there you're hearing about now... people are just... 
formerly known as etaoin...
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Joined: Oct 2000
Posts: 5,400
Carpal Tunnel
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Carpal Tunnel
Joined: Oct 2000
Posts: 5,400 |
remember to click on of troy
Allus did :)
You can hit on me, too, Mav dear if you want.. i wouldn't say no...
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Joined: Mar 2000
Posts: 11,613
Carpal Tunnel
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Carpal Tunnel
Joined: Mar 2000
Posts: 11,613 |
Well for heaven's sake. Here I've been trying to get a couple of friends (the ones who always get all excited over those pass-around myths) here in town to always check with snopes; and it never even occurred to me that these pictures might not be what they purported to.
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Joined: Sep 2001
Posts: 6,296
Carpal Tunnel
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Carpal Tunnel
Joined: Sep 2001
Posts: 6,296 |
Thanks, faldage, for snooping up snopes.
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