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A room contains air in which the speed o...

A room contains air in which the speed of sound is `340m//s.` The walls of the room are made of concrete in which the speed of sound is `1700m//s` (a) Find the critical angle for total internal refection of sound at the concrete-air boundary.(b) in which medium must the sound be travelling to undergo total internal reflection?

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The correct Answer is:
(a) `sin^(-1) ((1)/(5))`; (b) air
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