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An artificial black hole that traps sound instead of light has been created in an attempt to detect theoretical Hawking radiation. The radiation, proposed by physicist Stephen Hawking more than 30 years ago, causes black holes to evaporate over time.
physicists have also been developing 'black holes' for sound. They do this by coaxing a material to move faster than the speed of sound in that medium, so that sound waves travelling within it cannot keep up, like fish swimming in a fast-moving stream. The sound is effectively trapped in the stream-like event horizon.
The team cooled 100,000 or so charged rubidium atoms to a few billionths of a degree above absolute zero and trapped them with a magnetic field. Using a laser, the researchers then created a well of electric potential that attracted the atoms and caused them to zip across the well faster than the speed of sound in the material.
Originally posted by rogerstigers
reply to post by chiron613
In addition, Sound, like voltage, is an effect of energy. A sound wave has no existance of it's own, rather it exists as an effect on matter.
This is always hard for me to explain, but let's give it a shot. When you turn to someone in the grocery store and say "hey great price on spam, eh?", that sound reaches them at approx 750MPH. But they do not get hit by a 750mph gust of air from your mouth. In fact the air from your mouth doesn't go more than a foot or so and only travels about 10-20 MPH. The wave effect of the sound is transmitted from one molecule of air to another. This transmission effect has no speed limit and could *theoretically* be coaxed to go much faster than light depending on the material it is travelling on.