sound travelling faster than the speed of light? (1 Viewer)

[hanley]

http://www.physorg.com/news88249076.html

 

[Bladez]

http://www.physorg.com/news88249076.html

wtf...negative velocity?

We also achieved what is known as a ‘negative group velocity,’ a situation in which the peak of the output pulse exits the filter before the peak of the input pulse has reached the beginning of the filter,” explained Robertson. “Using the definition for speed as being equal to distance divided by time, we measured a negative time and thus realized a negative velocity.

 

[Goff]

Right, that's the world we know all mussed up. Strange, I don't feel any different.

 

[theoootini]

so can we listen back in time yet or wha?