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27 May, 07:55

Sound waves travel at the rate of 343 m/s at 20°C. If a man standing 450 meters away from the wall of a canyon yells, "Hello," how long will it take for him to hear his own voice echo off of the wall?

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  1. 27 May, 09:31
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    2.62seconds

    Explanation:

    Echo occurs when sound reflects and causing a delay before getting to the listener.

    Let x be the distance from between the source and the reflector

    t be the time taken for the echo to occur

    v be the velocity of sound in air.

    Using the relationship 2x = vt

    t = 2x/v

    Given x = 450metres

    v = 343m/s

    t = 2 (450) / 343

    t = 900/343

    t = 2.62seconds

    It will take 2.62 seconds for him to hear his own voice echo off of the wall.
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