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2. Noise barrier - Wikipedia

   en.wikipedia.org/wiki/Noise_barrier

   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. Noise barriers are the most effective method of mitigating roadway, railway, and industrial noise sources – other than cessation of ...

3. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   Soundproofing is any means of impeding sound propagation.There are several basic ways to reduce sound: increasing the distance between source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using active antinoise sound generators.

4. 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.

5. Optimo (EP) - Wikipedia

   en.wikipedia.org/wiki/Optimo_(EP)

   Optimo is the third EP by American dance-punk band Liquid Liquid. It was released through 99 Records in 1983, becoming the band's final release until the 1997 compilation album Liquid Liquid. The EP includes Liquid Liquid's best-known song "Cavern", which was the subject of a dispute after being used for Grandmaster Melle Mel 's "White Lines ...

6. Acoustical engineering - Wikipedia

   en.wikipedia.org/wiki/Acoustical_engineering

   Acoustical engineering (also known as acoustic engineering) is the branch of engineering dealing with sound and vibration. It includes the application of acoustics, the science of sound and vibration, in technology. Acoustical engineers are typically concerned with the design, analysis and control of sound. One goal of acoustical engineering ...

7. 11 photos of America's fighter jets breaking the sound barrier

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

   11 photos of America's fighter jets breaking the sound barrier. At a speed of about 767 miles per hour, depending on temperature and humidity, a moving object will break the sound barrier. It was ...