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30 July, 01:36

Three guys are standing in a row, facing a solid, high wall. Guy A is 10 m from the wall, B is 20 m away from the wall, and C is 30 m away from it. Guy B shouts. Will any other guy be able to hear an echo of Guy B's shout?

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  1. 30 July, 03:22
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    Only guy B and C will be able to hear the echo but guy A will not be able to hear the echo

    Explanation:

    Given that:

    Guy A = 10 m away from the wall

    Guy B = 20 m away from the wall

    Guy C = 30 m away from the wall

    At standard Temperature of 20 °C, velocity of sound in dry air ≅ 343 m/s. As such, if there is a reflecting object that produces an echo, it mustn't be more than 17.2 m from where the sound is originating from. As the sound is coming from guy B who is 20 m away, only Guy B and C who are above 17.2 m will only perceive the echo.
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