Question

A room contains air at 30°C, in which the speed of sound is 349 m/s. The walls of the room are made of concrete in which the speed of sound is 1850 m/s. (a) Find the critical angle for total internal reflection of sound at the concrete-air boundary. (b) In which medium must the sound be traveling to undergo total internal reflection? air O concrete (c)A bare concrete wall is a highly efficient mirror for sound. Give evidence for or against this statement. This answer has not been graded yet Need Help? Lhaan
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