声速打破光速极限

声速打破光速极限

美国物理学家设计了一种不同寻常的波导，使得声音在其中的传播速度超过光速。

Sound breaks the light barrier (Jan 12)
http://physicsweb.org/article/news/11/1/8
Nothing can travel faster than lightâEUR¦ except for sound. This is the
claim of some US physicists, who say they have designed an unusual
waveguide to make sound move at "superluminal" speeds (Appl. Phys. Lett.
90 014102).