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Science Museum of Minnesota: Wild Music: About Sound: Mosquito [Hearing Test]
How good is your hearing? Take a hearing test to determine the range of frequencies that you, other humans, and other animals can hear.
Khan Academy
Khan Academy: Vi Hart: What Is Up With Noises?
Video illustrating and explaining some of the mathematical and wave properties behind sound, frequency, and pitch. [12:49]
Khan Academy
Khan Academy: The Science and Mathematics of Sound, Frequency, and Pitch
Video illustrating and explaining some of the mathematical and wave properties behind sound, frequency, and pitch.