Suppose you are near one end of a 150-m-long cylindrical tunnel open to the air on both ends. If you give a shout, you might hear an echo.

Name: Suppose you are near one end of a 150-m-long cylindrical tunnel open to the air on both ends. If you give a shout, you might hear an echo.
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Question

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Sound can reflect off surfaces such as the walls of a tunnel. If the tunnel is long enough, the sound of your shout can travel to the other end, reflect off the wall, and travel back to you as an echo.

Suppose You Are near One End of a 150-M-Long Cylindrical