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  2. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    A whistle is a device that makes sound from air blown from one end forced through a small opening at the opposite end. They are shaped in a way that allows air to oscillate inside of a chamber in an unstable way. The physical theory of the sound-making process is an example of the application of fluid dynamics or hydrodynamics and aerodynamics ...

  3. Electromagnetically induced acoustic noise - Wikipedia

    en.wikipedia.org/wiki/Electromagnetically...

    resistors: the braking resistors of electric trains, used to dissipate electrical power when the catenary is not receptive during braking, can make electromagnetically induced acoustic noise; coils: in magnetic resonance imaging, "coil noise" is that part of total system noise attributed to the receiving coil, due to its non-zero temperature.

  4. Whistling - Wikipedia

    en.wikipedia.org/wiki/Whistling

    Whistling can be used to control trained animals such as dogs. A shepherd's whistle is often used instead. Whistling has long been used as a specialized communication between laborers. For example, whistling in theatre, particularly on-stage, is used by flymen (members of a fly crew) to cue the lowering or raising of a batten pipe or flat. This ...

  5. What's that horrible whistling noise at Brunner Island? Unit ...

    www.aol.com/whats-horrible-whistling-noise...

    A whistling noise has been coming from a power plant in northeastern York County since last week, but residents in nearby municipalities soon will get relief from the annoying noise.

  6. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.

  7. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    The name was given because the sound slowly decreases in frequency over about seven minutes. It was recorded using an autonomous hydrophone array. [8] The sound has been picked up several times each year since 1997. [9] One of the hypotheses on the origin of the sound is moving ice in Antarctica. Sound spectrograms of vibrations caused by ...

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