Generally, smaller birds create higher frequency sounds while larger birds create lower frequency sounds. The global analysis ...

Using high-frequency sound waves to make tunable optical filters, modulators and Q-switches is a well-established and convenient technological solution for many applications, reports Neil Savage.

A glass will smash if sound waves travel through the glass at its natural frequency. In the example in the video that is around 550 hertz. Ultrasound can be used to clean delicate objects like ...

Amateur radio operators and shortwave listeners have a common enemy: QRM, which is ham-speak for radio frequency interference caused by man-made sources. Indiscriminate, often broadband in nature ...