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Sibyyl
Gallente Federation
1752
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Posted - 2014.06.19 22:50:00 -
[1] - Quote
Ria,
Wanted to start a discussion in reference to your post here:
This quote from the article seems poignant:
Quote:Such an exotic medium can be engineered to slow a light beam 20 million-fold from 186,282 miles a second to a pokey 38 miles an hour.
I wanted to write down what I understand, and I hope some of the smarter posters will respond (James, I am looking at you).
-Often "speed of light" is meant to refer to the speed of a group of photons (which may or may not be c, not individual photons (always c). I think it's disingenuous to claim "we slowed light down".. instead it's more accurate to say "we slowed down the observed speed of a group of photons).
-If photons travel through a medium and are absorbed in transit, and then "spit" out later, the absorption will correlate to elevated electron energy levels which may not propagate at c, however, the transit of photons as photons always occur at c
-If photons are refracted in a medium, then they will bounce around at c through the medium, and their observed speed as a group will be less than c
It doesn't appear to me that Ria's linked experiment changes anything about the speed of light. Is this a correct statement?
.. when everything else is gone .. |
Doreen Kaundur
573
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Posted - 2014.06.20 01:00:00 -
[2] - Quote
Usually when people speak of light speed, it is the speed through empty space. Not through any medium.
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Riyria Twinpeaks
Reasonable People Of Sound Mind
1991
|
Posted - 2014.06.20 04:33:00 -
[3] - Quote
I found this interesting with regards to light "slowing down" in materials. |
Aspalis
Red Federation RvB - RED Federation
1682
|
Posted - 2014.06.20 08:17:00 -
[4] - Quote
Slightly offtopic: In astronomy, light speed serves more as a ruling stock for how far light travels given time.
Light travels 299,792,458 m/s. It takes eight seconds for light from our Sun (Sol) to reach us here on Earth. The closest star to us is Proxima Centauri at 4.24 light-years, meaning that we see the light from Proxima Centauri as it were 4.24 years ago. The farthest object from us is the proto-galaxy UDFj-39546284 at 13.42 billion light-years. Marcus Gord: "Aspalis is an onion. Many layers, each one makes you cry." |
Mizhir
Euphoria Released Triumvirate.
63677
|
Posted - 2014.06.20 08:20:00 -
[5] - Quote
For a disk shaped object with the radius 'Z' and thickness 'A' the volume is:
V = Pi*Z*Z*A One Man Crew - Collective solo pvp |
Aspalis
Red Federation RvB - RED Federation
1682
|
Posted - 2014.06.20 08:25:00 -
[6] - Quote
Mizhir wrote:For a disk shaped object with the radius 'Z' and thickness 'A' the volume is: V = Pi*Z*Z*A
GET OUT YOU NERD! Marcus Gord: "Aspalis is an onion. Many layers, each one makes you cry." |
Mizhir
Euphoria Released Triumvirate.
63677
|
Posted - 2014.06.20 08:28:00 -
[7] - Quote
Aspalis wrote:Mizhir wrote:For a disk shaped object with the radius 'Z' and thickness 'A' the volume is: V = Pi*Z*Z*A GET OUT YOU NERD!
Sorry. I didn't order extra onion for my pizza One Man Crew - Collective solo pvp |
Ria Nieyli
11552
|
Posted - 2014.06.20 16:56:00 -
[8] - Quote
Sibyyl wrote:Ria, Wanted to start a discussion in reference to your post here: This quote from the article seems poignant: Quote:Such an exotic medium can be engineered to slow a light beam 20 million-fold from 186,282 miles a second to a pokey 38 miles an hour. I wanted to write down what I understand, and I hope some of the smarter posters will respond (James, I am looking at you). -Often "speed of light" is meant to refer to the speed of a group of photons (which may or may not be c, not individual photons (always c). I think it's disingenuous to claim "we slowed light down".. instead it's more accurate to say "we slowed down the observed speed of a group of photons). -If photons travel through a medium and are absorbed in transit, and then "spit" out later, the absorption will correlate to elevated electron energy levels which may not propagate at c, however, the transit of photons as photons always occur at c-If photons are refracted in a medium, then they will bounce around at c through the medium, and their observed speed as a group will be less than cIt doesn't appear to me that Ria's linked experiment changes anything about the speed of light. Is this a correct statement?
Phase velocity Cherenkov radiation Do not remove a fly from your friend's forehead with a hatchet.
- Ancient Chinese Proverb |
Eurydia Vespasian
Storm Hunters Disturbed Acquaintance
9181
|
Posted - 2014.06.20 18:06:00 -
[9] - Quote
i have not much add so i'll just use this formula as my mathematic contribution. |
Kijo Rikki
Powder and Ball Alchemists Union The Predictables
814
|
Posted - 2014.06.20 18:25:00 -
[10] - Quote
Aspalis wrote:Slightly offtopic: In astronomy, light speed serves more as a ruling stock for how far light travels given time.
Light travels 299,792,458 m/s. It takes eight seconds for light from our Sun (Sol) to reach us here on Earth. The closest star to us is Proxima Centauri at 4.24 light-years, meaning that we see the light from Proxima Centauri as it were 4.24 years ago. The farthest object from us is the proto-galaxy UDFj-39546284 at 13.42 billion light-years.
Minutes :( It is really hard to change your signature settings |
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Aspalis
Red Federation RvB - RED Federation
1706
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Posted - 2014.06.21 12:18:00 -
[11] - Quote
Kijo Rikki wrote:Aspalis wrote:Slightly offtopic: In astronomy, light speed serves more as a ruling stock for how far light travels given time.
Light travels 299,792,458 m/s. It takes eight seconds for light from our Sun (Sol) to reach us here on Earth. The closest star to us is Proxima Centauri at 4.24 light-years, meaning that we see the light from Proxima Centauri as it were 4.24 years ago. The farthest object from us is the proto-galaxy UDFj-39546284 at 13.42 billion light-years. Minutes :(
Sorry! Can I get away with that I had yet to get my first cup of coffee?
Thank you for correcting me though. Marcus Gord: "Aspalis is an onion. Many layers, each one makes you cry." |
Grimpak
Shifting Sands Trader Cartel Bleak Horizon Alliance.
1579
|
Posted - 2014.06.21 13:11:00 -
[12] - Quote
wait, is this thread about the speed of light in ideal conditions (absolute vacuum)?
what's there to argue anyways? [img]http://eve-files.com/sig/grimpak[/img]
[quote]The more I know about humans, the more I love animals.[/quote] ain't that right |
Kijo Rikki
Powder and Ball Alchemists Union The Predictables
817
|
Posted - 2014.06.21 16:03:00 -
[13] - Quote
Aspalis wrote:Kijo Rikki wrote:Aspalis wrote:Slightly offtopic: In astronomy, light speed serves more as a ruling stock for how far light travels given time.
Light travels 299,792,458 m/s. It takes eight seconds for light from our Sun (Sol) to reach us here on Earth. The closest star to us is Proxima Centauri at 4.24 light-years, meaning that we see the light from Proxima Centauri as it were 4.24 years ago. The farthest object from us is the proto-galaxy UDFj-39546284 at 13.42 billion light-years. Minutes :( Sorry! Can I get away with that I had yet to get my first cup of coffee? Thank you for correcting me though.
Of course! I can even edit my post and we can pretend like this never happened!
To Grimpak, no. The argument is about the speed of light through various mediums other than a vacuum, particularly the one in the article that claims to slow light down to 38 miles per hour. There are some interesting things being discussed here concerning phase velocity and group velocity that I don't quite understand yet even with the picture on the wiki page. But I can accept that these things happen, now....
My only question is what happens to the light once it returns to a vacuum? Does it maintain it's current speed? Or does it somehow return to c? It is really hard to change your signature settings |
Grimpak
Shifting Sands Trader Cartel Bleak Horizon Alliance.
1579
|
Posted - 2014.06.21 16:20:00 -
[14] - Quote
Kijo Rikki wrote:My only question is what happens to the light once it returns to a vacuum? Does it maintain it's current speed? Or does it somehow return to c?
well, off-the-knee logic would dictate that for increasing speed, you would need more energy. unless photons manage to keep their energy while transversing a more dense medium. [img]http://eve-files.com/sig/grimpak[/img]
[quote]The more I know about humans, the more I love animals.[/quote] ain't that right |
Bagrat Skalski
Poseidaon
2032
|
Posted - 2014.06.21 20:18:00 -
[15] - Quote
Grimpak wrote:Kijo Rikki wrote:My only question is what happens to the light once it returns to a vacuum? Does it maintain it's current speed? Or does it somehow return to c? well, off-the-knee logic would dictate that for increasing speed, you would need more energy. unless photons manage to keep their energy while transversing a more dense medium.
The portion of energy is absorbed. The rest is just what it is, an energy, and goes with the speed of light.
http://en.wikipedia.org/wiki/Absorption_%28electromagnetic_radiation%29 When weapons, technology, and economies mature faster than the leadership culture entrusted with them, disaster ensues. http://i.minus.com/ibeZ0sJewvDMBN.gif |
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