Can a human produce an ultrasound?
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The vocal cords themselves in humans are not capable of vibrating with the frequency of ultrasound (above 20 kHz). But due to the fact that different structures of the vocal apparatus are involved in sound extraction, a person does not emit a pure tone, but fluctuations in a wide range, where frequencies above 20 kHz can also be present.
The spectrum of sound that occurs when a tooth strikes a tooth generally extends to hundreds of kilohertz.
