| Light stopped for a second! |
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| Written by Administrator | |
| Wednesday, 03 February 2010 | |
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In a cloud of sodium atoms created, chilled to extremely low temperatures, the radius (pulse) of light stopped for more than a second. The speed with which the light penetrated the cloud of sodium was estimated at only 25 kilometers per hour, informs "Physical Review Letters. Just a few months ago, finding a student, that running or riding a bike, you can move faster than light, quits would be the only teacher in this case a fair assessment - inadequate. After all, it is well known that light moves at an incredibly great speed about 300 thousand km / s, and exactly 299 792 458 m / s - is the speed of propagation of electromagnetic wave in a vacuum. Today we know that light at the appropriate conditions, penetrating the cloud created by the sodium atoms, chilled to very low temperatures (Bose-Einstein condensate) can significantly relieve achieving remarkably low speed of 25 km / h! Experiment in which light was able to release up to 25 km / h was carried out by researchers at the University Harvard. It consisted of clouds, composed of sodium atoms come into laser light, with appropriately tailored to the physical parameters of the experiment. Change - at the quantum level - that occur inside a cloud of sodium caused the blowing ray of light in a pulse length of about 1 kilometer " was at 20 microns (!) Bose-Einstein condensate. In this way light is retained in a cloud of sodium for about half a second. This time is nearly three times longer than previously recorded record light beam suspension - 600 ms. According to the researchers, the new discovery cannot be practically used yet, although work is being done towards the creation of a system, which would be used in computer science and cryptography. |
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| Last Updated ( Friday, 05 February 2010 ) |
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