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The high-pitched noise produced by squeaky toys quickly attracts the attention of infants and small children, while their soft, squeezable nature makes them safe for young children to handle. Squeaky toys are also popular with pets, and examples shaped like bones or small furry animals are commonly marketed for dogs.
Rail squeal is a sound caused by a train's wheels slipping under specific conditions, usually around sharp curves. [4] Air displacement of a train in a tunnel can create noise from turbulence. Trains also use horns, whistles, bells, and other noise-making devices for both communications and warnings.
While the previous whistles occur at low flow speeds, this whistle occurs at very high speeds. When a subsonic jet impinges on a cavity, jet instability becomes part of the feedback loop as with the hole tone. When a supersonic jet impinges on a cavity, acoustic shock wave instability becomes part of the feedback loop. The figure on the right ...
An unexplained high-pitched tone has kept residents of a Portland suburb awake at night for at least a week. Mysterious high-pitched tone keeps Oregon residents up at night Skip to main content
Shrillness is a word used to describe the quality of sounds that have a high-pitched, strident, raucous, screeching or harsh character, such as those produced by a trumpet or piccolo, but it can also be used to describe a widely recognised and puzzling phenomenon whereby certain sounds are perceived as psychologically painful or aversive to a degree that cannot be accounted for simply in terms ...
The idea was born after he was irritated by a factory noise when he was a child. [6] The push to create the product was when Stapleton's 17-year-old daughter went to the store to buy milk and was harassed by a group of 12- to 15-year-olds. Using his children as test subjects, he determined the frequency of "The Mosquito". [7]
Singing sand dunes, an example of the phenomenon of singing sand, produce a sound described as roaring, booming, squeaking, or the "Song of Dunes". This is a natural sound phenomenon of up to 105 decibels, lasting as long as several minutes, that occurs in about 35 desert locations around the world. The sound is similar to a loud low-pitch rumble.
The hissing of high voltage transmission lines is due to corona discharge, not magnetism. The phenomenon is also called audible magnetic noise, [1] electromagnetic acoustic noise, lamination vibration [2] or electromagnetically induced acoustic noise, [3] or more rarely, electrical noise, [4] or "coil noise
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