T-Nemesis Posted November 3, 2005 Share Posted November 3, 2005 Can sound waves travel faster than the speed of light? Yes, says Joel Mobley, a physicist at the University of Mississippi in the US. In simulations Mobley has shown that ultrasound pulses could move at "superluminal" speeds when they enter water that contains thousands of tiny plastic beads. Source: http://physicsweb.org/articles/news/9/11/1/1 What do you all make of this? Link to comment Share on other sites More sharing options...
Douglas Posted November 3, 2005 Share Posted November 3, 2005 It's an interesting article, it sounds a bit like the transmission of spread spectrum signals, which are dispersed on transmission and compressed on receiving. Seems like he's using the plastic balls as an acoustic dispersive delay line, just can't see where the speed of light comes in. Link to comment Share on other sites More sharing options...
5614 Posted November 3, 2005 Share Posted November 3, 2005 This is a common example of a well known totaly with in the laws of physics effect known as anomalous dispersion. There are many many threads about it... here's just one: http://www.scienceforums.net/forums/showthread.php?t=7718 use the search button to find many more! Link to comment Share on other sites More sharing options...
T-Nemesis Posted November 3, 2005 Author Share Posted November 3, 2005 This is a common example of a well known totaly with in the laws of physics effect known as anomalous dispersion. There are many many threads about it... here's just one: http://www.scienceforums.net/forums/showthread.php?t=7718 use the search button to find many more! Correct me if I'm wrong but isn't Anomalous Dispersion something that effects light, not sound? Link to comment Share on other sites More sharing options...
5614 Posted November 3, 2005 Share Posted November 3, 2005 Anomalous dispersion effects a wave... sound is a wave (as is light). Link to comment Share on other sites More sharing options...
swansont Posted November 3, 2005 Share Posted November 3, 2005 Correct me if I'm wrong but isn't Anomalous Dispersion something that effects light, not sound? You're wrong. Link to comment Share on other sites More sharing options...
T-Nemesis Posted November 3, 2005 Author Share Posted November 3, 2005 Thanks for the information Link to comment Share on other sites More sharing options...
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