Chorus waves are a kind of "whistler" wave, named for the sound emitted by a radio receiver when they are detected. These naturally occurring waves ripple through the "ocean" of charged particles ...

It was the first time these sound waves had been extracted and made audible. So what's going on here? We might not be able to ...

Ultrasound, like audible sounds, is transmitted by means of longitudinal waves. Ultrasound is used in medicine to break up kidney stones and gall stones. It is also used, in a process known as ...

Piezoelectric audio transducers use a metal plate in conjunction with the piezo ceramic element. The metal plate vibrates when the element expands and contracts, producing an audible sound. Frequency ...