trumpet the sound from the trumpet comes from a vibrating column of air created by buzzing lips of the trumpeter A sound wave is a longitudinal wave. When an object vibrates it produces a ...

回声定位叫声通常为超声波——频率范围在20赫兹至200千赫兹之间，而人类的正常听力上限通常约为20千赫兹。即便如此，我们仍能听到某些蝙蝠（例如斑点蝠）发出的回声定位声。这些噪音类似于两颗圆形卵石相互撞击所产生的声音。总体而言，回声定位叫声的特征体现于 ...

Using an air vortex cannon to focus the sound waves from the bass reflex port, it ‘wiggles’ the flame out in a matter of seconds, as illustrated with a thermal camera. Compared to the much ...

Nick Valencia reports on acoustic levitation developed by AcoustoFab.

See, every sound travels in the form of a wave, also called a sound wave — and each one is different. This is a sound wave of me saying "hello." And here's "goodbye." See? They're different.

A ultrasound technique from the University of Nottingham will allow the production of sharper images inside live cells without causing damage at resolutions that were previously unattainable.

Researchers in Australia have developed a new type of 3D bioprinter that uses sound waves to coax cells toward a desired ...

In fact, this new technology, which uses sound waves to enable digital payments, is slowly taking over the QR Code and NFC. Moreover, the technology works offline and supports both smartphones and ...