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Problem 41 Medium Difficulty

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.

Answer

a. $10.7^{\circ}$
b. $\text { air }$
c. $\begin{array}{l}{\text { The statement is correct. Because the concrete wall reflects all sounds with the incident angle between } 10.7 \text { to } 90} \\ {\text { degrees. }}\end{array}$

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Top Physics 103 Educators
Andy C.

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Video Transcript

but a healthy given problem. The sign. Oh, so the the dingo off the critical angle. Easy call to side in Warsaw from signing Worse if we wondered why baby too, Um, where we want is Ah 3 43 divided by. And he too is 1850 50. Uh, excuse us. A critical angle off, then poor and seven degrees. But me sound sound must be traveling in the air in air in order to undergo total in tow. Internal reflection. But see the statement is correct because the concrete walls agreed. World's reflect reflects all songs A LL sounds with the instant angle between a 10.72 90 degrees agrees.

Wesleyan University
Top Physics 103 Educators
Andy C.

University of Michigan - Ann Arbor

LB
Liev B.

Numerade Educator

Jared E.

University of Winnipeg

Meghan M.

McMaster University