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Ultrasonic, infrasonic and audio waves t...

Ultrasonic, infrasonic and audio waves travel though a medium with speeds `V_(u), V_(i)` and `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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