Proposal for Svetlana
 Posted: Fri Feb 23, 2007 6:19 pm |
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| queenslander |
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| Location: Limassol |
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| I think Svetlana = thermodynamics and some |
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| Posted: Fri Feb 23, 2007 6:20 pm |
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| BOF |
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| Joined: 29 Oct 2006 |
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| Posted: Fri Feb 23, 2007 6:35 pm |
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| Pete_D |
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| queenslander wrote: |
| I think Svetlana = thermodynamics and some |
queenslander, I already asked Lana on a date the next time I'm in pafos and she ignored me.... so if that's what happens to me, then just imagine what little chance you've got  |
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| Posted: Fri Feb 23, 2007 6:50 pm |
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| devil |
| lecturer |
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| osintseva wrote: |
it was pointless locking his thread, why, to save space on a hard drive?
in any event gravity was supplying energy into his system.
if the 2nd law of thermodynamics is valid how does light accelerate when it leaves glass into a vaccuum or air. where do the photons get the energy to increase their speed. |
I'm not sure that your stupid question even deserves an answer. Light is electromagnetic radiation and, as such, is a form of energy, just as much as the sun's radiation is solar energy. The closer the molecules of the medium through which it flows, the slower it flows, in inverse proportion to the refractive index. Analogy: if you are rowing a boat, you are putting mechanical energy into the oar which moves slowly through the water. If you miss the stroke into the trough of a wave, the same energy causes the oar to whizz through the air much faster - and you to fall flat on your back!!! There is no change of energy when light passes losslessly from one medium to another. (Just as well, because fibre optics could not happen and we would be without the Internet)
Request: if you wish to pretend that the 2nd law doesn't work, please read a physics book. |
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| Posted: Fri Feb 23, 2007 7:09 pm |
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| osintseva |
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now you are resorting to insults, perhaps you should be banned?
"The closer the molecules of the medium through which it flows, the slower it flows, in inverse proportion to the refractive index" correct it loses energy, but your analogy is wrong as i am putting energy into the oar there is nothing to replenish the energy in the light therefore when it leaves the denser medium into air where does it regain its energy and therefore speed? |
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| Posted: Fri Feb 23, 2007 7:13 pm |
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| queenslander |
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Pete
Light is electromagnetic radiation and, as such, is a form of energy, just as much as the sun's radiation is solar energy. The closer the molecules of the medium through which it flows, the slower it flows, in inverse proportion to the refractive index. Analogy: if you are rowing a boat, you are putting mechanical energy into the oar which moves slowly through the water. If you miss the stroke into the trough of a wave, the same energy causes the oar to whizz through the air much faster - and you to fall flat on your back!!! There is no change of energy when light passes losslessly from one medium to another
It doesn't get more romantic than that |
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| Posted: Fri Feb 23, 2007 7:14 pm |
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| RichardB |
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Now I understand completely 
Hope everyone else is following this and learning  |
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| Posted: Fri Feb 23, 2007 8:22 pm |
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| osintseva |
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Ok thanks for the non insulting reply queenslander 
But the rowing analogy doesnt work as far as i can see as the energy put into moving the oar thro water is displacing a weight of water wheras as far as i know the light wave does not displace molecules of glass. Take the analogy of a bullet fired into a bag of water, it loses energy and decelerates as it passes thro and exits at a lower speed there is no way for it to regain the velocity it had previously. Light once it has left its source has a certain amount of energy and this cannot be replaced so as it decelerates in glass for example that energy must have gone somewhere or it would still be traveling at the speed of light in air. If the molecules of glass are interfereing with its progress they must be absorbing some energy and maybe warming the glass if not then there is nothing to slow thep rogress of the light wave and its speed would be constant and therefore not refract but it does refract so there must be interaction and lost energy. When it exits the glass how does it regain that energy which it must do to accelerate to the speed of light in air?
Anyway im of to the Ukraine tommorrow and on the instruction of my girlfriend have removed the hair from under my arms and my privates with some foul cream. Perhaps we can discuss dark matter or something at a later date. |
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| Posted: Fri Feb 23, 2007 11:02 pm |
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| Pete_D |
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| osintseva wrote: |
Anyway im of to the Ukraine tommorrow and on the instruction of my girlfriend have removed the hair from under my arms and my privates with some foul cream. Perhaps we can discuss dark matter or something at a later date. |
 Do you mind me asking, are you a man or a woman? I assumed you were male, but if you are... well then that's quite an unusual thing for a bloke to have done I think.....
Pete |
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| Posted: Fri Feb 23, 2007 11:19 pm |
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| queenslander |
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| Joined: 19 Jan 2007 |
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| Thats not what you told me yesterday Pete |
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