Why does a teakettle make noise as the water approaches a boil? What determines the frequencies of the sound?
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ANSWERS: 1
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Have you ever whistled? If you have, you know that it is accomplished by creating a small opening through which you then force air. As you for the air through this opening, it cause vibrations that we hear as a whistle. The same principle applies to a tea kettle. The ones that whistle have a lid that flops down over the spout. This lid has a small hole in it. As the water in the tea kettle comes to a boil, the pressure inside of the kettle increase forcing the gases inside out through the whole in the lid causing it to whistle. One of the factors that will control the frequency of the sound is the size of the opening. The smaller the opening, the higher the frequency of the whistle.
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