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    Jokercrazy95's Avatar
    Jokercrazy95 Posts: 1, Reputation: 1
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    #1

    Mar 14, 2012, 04:46 PM
    Physic answers?
    A hiker stands on one end of a canyon and shouts to hear his echo. If it takes 3 secounds for him to hear his echo what is the with of the canyon?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 15, 2012, 05:43 AM
    The sound waves have to travel across the canyon and back again for him to hear the echo, so the distance traveled in 3 seconds is two times the width of the canyon. If you know the speed of sound you multiply that by 3 seconds to get the distance traveled across the canyon and back, and then divide by two to get the width of the canyon.
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