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  2. Sound barrier - Wikipedia

    en.wikipedia.org/wiki/Sound_barrier

    Shock wave. 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 ...

  3. Supersonic speed - Wikipedia

    en.wikipedia.org/wiki/Supersonic_speed

    Supersonic speed. A United States Navy F/A-18F Super Hornet in transonic flight. U.S. Navy F/A-18 approaching the sound barrier. The white cloud forms as a result of the supersonic expansion fans dropping the air temperature below the dew point. [1][2] Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1).

  4. 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 ...

  5. Phase Linear - Wikipedia

    en.wikipedia.org/wiki/Phase_Linear

    The second amplifier released was the Phase Linear 400 with 200 watts per channel. It shared the same distinctive brushed aluminum, dual VU meters front panel style as the 700. It retailed for just under $500. [1] The next product was the Phase Linear 4000 Series Auto-correlation Pre-Amplifier introduced in 1973 and manufactured through 1978.

  6. Isolation amplifier - Wikipedia

    en.wikipedia.org/wiki/Isolation_amplifier

    Isolation amplifiers are a form of differential amplifier that allow measurement of small signals in the presence of a high common mode voltage by providing electrical isolation and an electrical safety barrier. They protect data acquisition components from common mode voltages, which are potential differences between instrument ground and ...

  7. Sonic boom - Wikipedia

    en.wikipedia.org/wiki/Sonic_boom

    The sound of a sonic boom depends largely on the distance between the observer and the aircraft shape producing the sonic boom. A sonic boom is usually heard as a deep double "boom" as the aircraft is usually some distance away. The sound is much like that of mortar bombs, commonly used in firework displays. It is a common misconception that ...

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