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Whistle: Difference between revisions
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Robot: Automated text replacement (-\[\[Automobile\|([\w|\s]*)\]\] +\1)
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A steam whistle works the same way, but using steam as a source of pressure: such whistles can produce extremely high sound intensities. | A steam whistle works the same way, but using steam as a source of pressure: such whistles can produce extremely high sound intensities. | ||
Sometimes, unintentional whistles can be set up. A common one is the opened [[sunroof]] of a | Sometimes, unintentional whistles can be set up. A common one is the opened [[sunroof]] of a car: air passing over the top of the vehicle can, at certain speeds, strike the back edge of the sunroof, creating a very low frequency whistle which is resonated by the closed interior of the car. Since the sound frequency is [[infrasonic]], around 4 [[Hertz|Hz]], the effect is very uncomfortable for occupants, who feel the vibration rather than hear it. Such low frequencies can induce [[nausea]], [[headache]], [[delirium|disorientation]] and [[dizziness]]. The effect can be prevented by opening a side window a few inches. Subsonic whistles have also been developed for use as weapons, or to deliberately create a sense of uneasiness in an enemy. | ||
== Industrial whistles == | == Industrial whistles == | ||