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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.k`.The walls of the room are made of concerte in whichthe speed of sound is`1700m//s`(a)Find the critical angle for total internal relfection of sound at the concrete-air boundary.(b)in which medium must the sound be travelling to undergo toal internal refelection?

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