Experiments of rock fracture verified that strong lowfrequencywave could be received both on the surface of rocks and in the air before the main fracture.
岩石破裂实验证实主破裂前在岩石表面和空气中均收到较强的低频波。
2
Based on wave acoustics, the lowfrequency sound field is analyzed in this paper, and reciprocity is verified both theoretically and experimentally.
文章根据波动声学的观点对房间内的低频段声场做分析，理论和实验都验证了这个结论。
3
Taken the Earth as material of antenna for receiving gravitational wave, the Earth behaves as a low-frequency gravitational detector.