Hey Ray: The many different waves 02:35. PITTSBURGH (KDKA) - The universe is full of waves, and they are not all created equally. Some are mechanical, and others are electromagnetic, even though ...

Mechanical waves cause oscillations of particles in a solid, liquid or gas and must have a medium close medium A material through which a wave can be transmitted (propagate). to travel through.

Background What we experience as sound is actually a mechanical wave, produced by the back-and-forth vibration of particles in the air (or whatever medium is around our ears—remember sound ...

A new type of extinguisher that uses sound waves to put out fires has been built by two engineering students in the US. Both chemical- and water-free, the invention offers a relatively non-destructive ...