Special substance that slows down the speed of light!

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Offline Seany

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OK.. My science teacher said that there is a special substance, gas, that can slow down the speed of light..

Is this true? And what benefits, disadvantages can the invention of this do?
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Offline daveshorts

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Special substance that slows down the speed of light!
« Reply #1 on: 07/06/2007 00:24:42 »
Most things slow down the speed of light, glass will slow it down by a factor of 1.5 to 2,  diamond by a factor of about 2.5, this is actually why light refracts see the dissappearing pyrex experiment:

http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/making-pyrex-invisible/

There have been some exotic materials made with much higher refractive indexes at a certain wavelength so light will travel at only a few m/s, but these generally have to be powered with laser light at another wavelength and are very complex.

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Offline _Stefan_

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Special substance that slows down the speed of light!
« Reply #2 on: 07/06/2007 07:15:44 »
I read about a 'cloud' of gass that could 'freeze' photons for a period of time. Something about using this in quantum computers.
Stefan
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Offline lightarrow

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Special substance that slows down the speed of light!
« Reply #3 on: 08/06/2007 13:48:46 »
I read about a 'cloud' of gass that could 'freeze' photons for a period of time. Something about using this in quantum computers.
Yes, it's true! It seems possible to "freeze" single photons and store them! Physicists are studying this, with Bose-Einstein Condensates.

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Offline dentstudent

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Special substance that slows down the speed of light!
« Reply #4 on: 08/06/2007 14:51:34 »
I read about a 'cloud' of gass that could 'freeze' photons for a period of time. Something about using this in quantum computers.
Yes, it's true! It seems possible to "freeze" single photons and store them!


Would that make it a light snack?

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Offline lightarrow

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Special substance that slows down the speed of light!
« Reply #5 on: 09/06/2007 19:23:42 »
I read about a 'cloud' of gass that could 'freeze' photons for a period of time. Something about using this in quantum computers.
Yes, it's true! It seems possible to "freeze" single photons and store them!
Would that make it a light snack?
Absolutely!  [;D]

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Offline Seany

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Special substance that slows down the speed of light!
« Reply #6 on: 10/06/2007 16:27:14 »
Heeheee.... I wonder what light particles look like?
They say that when you die, your life flashes in front of you. Make it worth watching!