Ultrasonic, Infrasonic and audible waves...

Ultrasonic, Infrasonic and audible waves travel through a medium with speeds `V_(u),V_(i) and V_(a)` respectively, then

`V_(u), V_(i) and V_(a)` are nearly equal

`V_(u)ge V_(a)geV_(i)`

`V_(u)le V_(a)leV_(i)`

`V_(a) le V_(u) and V_(u)~~V_(i)`

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