Question: We can make a simple model of the human vocal tract as an open-closed tube extending from the opening of the mouth to the diaphragm.

We can make a simple model of the human vocal tract as an open-closed tube extending from the opening of the mouth to the diaphragm. What is the length of this tube if its fundamental frequency equals a typical speech frequency of 250 Hz? The speed of sound in the warm air is 350 m/s.

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