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/sci/ - Science & Math

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2045753 No.2045753 [Reply] [Original]

So, is the speed of light unbreakable?
Can light travel faster than C?

The answer is yes, and we've known for 10 years.

http://www.cbsnews.com/stories/2000/07/19/tech/main216905.shtml

EINSTEIN STATUS:
[ ]TOLD
[ ]NOT TOLD
[ ]FUCKING TOLD
[X]FUCKING DEAD (AND TOLD)

>> No.2045758

>cbsnews

Yeah... link me to the scientific paper once you find it.

>> No.2045762

Nothing can travel faster than light in a vacuum. In a vacuum, light is the fastest thing around. In a vacuum, the speed of light is a constant.

In other mediums however, the speed of light is different.

Retards gonna retard

>> No.2045764

>>2045762
But ostensibly, mediunms should slow light down, not increase its relative speed.

>> No.2045767

>>2045764
I didn't read the article, I just know that usually is what the problem is when people are like "LOL FASTER THAN LIGHT!!! XD!!!!"

Also, this is an american news corporation, and thus everything on their site should be taken with a grain of salt

>> No.2045768

>>2045762
I know is slower on water or air, but can the medium do it faster?

>> No.2045771 [DELETED] 
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2045771

CherenkovRadiation.jpg

>> No.2045775

>>2045753

fucking dead and told...lol'd

>> No.2045776

>>2045764
>>2045768

Actually read the article you niggers, it explains it quite nicely. It changes the light from particles to waves or some bullshit like that, i'm not a physics, i'm a lawyer.

TLDR: read the article you niggers

>> No.2045778

I always thought the speed of light is ALWAYS constant. Whether in a medium or not. Because the medium doesn't really slow it down, it just causes it to stop for a while (electrons absorb the energy, jump to a higher energy state and then release that energy as light). How does this speed up the speed of light is beyond me.

>> No.2045779

>>2045776
But light is already both a particle and a wave. AT THE SAME TIME.

>> No.2045784

>>2045778
Light has been slowed to as slow as 38mph.

>> No.2045785

>>2045779
The most physics i'v ever done was highschool physics. I'm a science fan, not a scientist.

Ask josef later when he shows up

>> No.2045789

>>2045784
Does this mean that the actual beam of light has been traveling that speed or light has gone through a medium and all the delays caused it to appear to go out the other end at that speed?

>> No.2045795

>>2045784

No it hasn't, you stupid shit. What happened was:

Move at c
Get trapped in an atom for a few miliseconds
Move at c
Get trapped in an atom for a few miliseconds
Move at c

Average speed, 38 mph

>> No.2045817

>>2045795
http://en.wikipedia.org/wiki/Slow_light
derp

>> No.2045835

>>2045817

"When light enters a material, photons are absorbed by the atoms in that material, increasing the energy of the atom. The atom will then lose energy after some tiny fraction of time, emitting a photon in the process. This photon, which is identical to the first, travels at the speed of light until it is absorbed by another atom and the process repeats. The delay between the time that the atom absorbs the photon and the excited atom releases as photon causes it to appear that light is slowing down. "

herp

>> No.2045837

Wouldn't something move fastest in a small? A medium doesn't sound aerodynamic.

>> No.2045841

>>2045776

>Aephraim Steinberg, a physicist at the University of Toronto, said the light particles coming out of the cesium chamber may not have been the same ones that entered, so he questions whether the speed of light was broken.


>Lawyer big mouthing about physics, awesome.

>> No.2045862

>>2045835
Too bad that block of text isn't anywhere in the article.
hurr

>> No.2045864

>>2045841
But still, how did they reproduce light that was exactly the same as the light that entered?

>> No.2045866

>>2045862

I saw no point in quoting:

"Slow light refers to a large reduction in the group velocity of light"

Because you clearly have no idea what it means.

>> No.2045869

>>2045866
Or maybe you don't!

>> No.2045879

>>2045837
lol

>> No.2045900
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2045900

>Can light travel faster than C?

Of course it can, with C++.

>> No.2045903

>>2045864
>that was exactly the same

The laser pulse in the NEC experiment exits the chamber with almost exactly the same shape, but with less intensity, Wang said.

>> No.2045913

http://arxiv.org/abs/physics/0012060
According to the authors:
>This counterintuitive effect is a direct result
of the rephasing process owing to the wave nature of light and is not at odds with either causality
or Einstein’s theory of special relativity.

Also, here's an old applet that explains how this works:
http://gregegan.customer.netspace.net.au/APPLETS/20/20.html

>> No.2045975

>>2045903
As would any light through a medium.

>> No.2045991

quantum entanglement allows us to affect one object and cause a reactionary effect on another tied to it across any distance instantaneously. space is just a construct that gives the illusion that matter is separate.

>> No.2046622

>>2045900

i lolzd

>> No.2046680

>>2045913
Interesting! This kind of superluminal wave propagation wasn't covered in any of my photonics courses, so I guess I learned something today.

Y'all should check out the app.

>> No.2046685

Hey guys, I just fired a laser at the moon, and then swept it across the moon's surface. The dot traveled across the room at a speed greater than C!

EINSTEIN STATUS:
[ ]TOLD
[ ]NOT TOLD
[ ]FUCKING TOLD
[X]FUCKING DEAD (AND TOLD)

>> No.2046688

Phase velocity =/= group velocity.

"The speed of light in a vacuum is a constant" is really just a layman's simplification of the real physics. A more correct statement is something like "the group velocity of light over an arbitrarily large distance in a vacuum is a constant."

>>2045991
For quantum entanglement to work, the entangled particles had to first be moved at a speed which is at most c, so information is not transmitted faster than that.

>> No.2046689

>>2046685
The moon, that should read.

>> No.2046698

>>2046685
Nicely done.