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Ultrasonic, Infrasonic and Audible waves...

Ultrasonic, Infrasonic and Audible waves travel through a medium with speeds `v_(u), v_(l), v_(a)` respectively, then

A

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

B

`V_(u)gtV_(a)gtV_(i)`

C

`V_(u)ltV_(a)ltV_(i)`

D

`V_(a)ltV_(u)" and "V_(u)~~V_(i)`

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The correct Answer is:
A
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