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2. Sound barrier - Wikipedia

   en.wikipedia.org/wiki/Sound_barrier

   The sound barrier or sonic barrier is the large increase in aerodynamic drag and other undesirable effects experienced by an aircraft or other object when it approaches the speed of sound. When aircraft first approached the speed of sound, these effects were seen as constituting a barrier, making faster speeds very difficult or impossible.

3. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Noise that travels across reflective surfaces, such as smooth floors, can be hazardous. Pathway alterations include physical materials, such as foam, absorb sound and walls to provide a sound barrier that modifies existing systems that decrease hazardous noise. Sound dampening enclosures for loud equipment and isolation chambers from which ...

4. Noise barrier - Wikipedia

   en.wikipedia.org/wiki/Noise_barrier

   The sound tube in Melbourne, Australia, designed to reduce roadway noise without detracting from the area's aesthetics. A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution.

5. 11 photos of America's fighter jets breaking the sound barrier

   www.aol.com/article/2016/03/07/11-photos-fighter...

   The pictures demonstrate the amazing visual effects that occur as military aircraft punch through the sound barrier and travel faster than sound itself. 11 photos of America's fighter jets ...

6. Ultrasonic antifouling - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_antifouling

   Ultrasound (ultrasonic) is sound at a frequency high enough that humans can not hear it. Sound has a frequency (low to high) and an intensity (quiet to loud). Ultrasound is used to clean jewellery, weld rubber, treat abscesses, and sonography. These applications rely on the interaction of sound with the media through which the sound travels.

7. Acoustic metamaterial - Wikipedia

   en.wikipedia.org/wiki/Acoustic_metamaterial

   The metamaterial acoustic cloak was designed to hide objects submerged in water, bending and twists sound waves. The cloaking mechanism consists of 16 concentric rings in a cylindrical configuration, each ring having acoustic circuits and a different index of refraction. This causes sound waves to vary their speed from ring to ring.