Whistle: Difference between revisions
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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]], about 4 [[Hz]] or so, the effect is very uncomfortable for occupants, who feel the vibration rather than hear it. Such low frequencies can induce nausea, headache, disorientation and dizziness. The effect can be prevented by opening a side window a few inches. | 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]], about 4 [[Hz]] or so, the effect is very uncomfortable for occupants, who feel the vibration rather than hear it. Such low frequencies can induce nausea, headache, disorientation and dizziness. The effect can be prevented by opening a side window a few inches. | ||
Also, the term | Also, as somewhat implied above, the term '''whistle''' may refer to any of several 2-octave musical instruments (more commonly known as penneywhistles, tinwhistles, or low whistles). See [[tinwhistle]] for information. | ||
