A room contains air in which the speed of sound is 343 m/s.The walls of the room are made of concrete, in which thespeed of sound is 1 850 m/s. (a) Find the critical angle fortotal internal reflection of sound at the concrete–air boundary.(b) In which medium must the sound be traveling inorder to undergo total internal reflection? (c) “A bare concretewall is a highly efficient mirror for sound.” Give evidencefor or against this statement.

University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter4: Diffraction
Section: Chapter Questions
Problem 28P: A water break at the entrance to a harbor consists of a rock barrier with a 50.0-m-wide opening....
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A room contains air in which the speed of sound is 343 m/s.
The walls of the room are made of concrete, in which the
speed of sound is 1 850 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 in
order to undergo total internal reflection? (c) “A bare concrete
wall is a highly efficient mirror for sound.” Give evidence
for or against this statement.

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