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What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound?
(a). Infrasound: The frequency range for infrasound is $0\ Hz-20\ Hz$.
(b). Audible sound: The frequency range for audible sound is $20\ Hz-20,000\ Hz$.
(c). Ultrasound: The frequency range for ultrasound is above $20,000\ Hz$.
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