What is the range of frequencies associated with:
$(a)$ Infrasound?
$(b)$ Ultrasound?
$(a)$ Infrasound?
$(b)$ Ultrasound?
(N/A) Infrasound: Frequencies less than $20\, Hz$.
$(b)$ Ultrasound: Frequencies more than $20000\, Hz$ (or $20\, kHz$).
$(b)$ Ultrasound: Frequencies more than $20000\, Hz$ (or $20\, kHz$).
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