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At a height of 15 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.150 s later. The air and water temperatures are 20°C. How deep is the lake?

  • Physics - ,

    look up speed of sound in water at 20C
    call it Cw
    look up speed of sound in air at 20C
    call it Ca
    then distance in water = 2d
    distance in air = 30
    time in water = t
    time in air = (.15 -t)
    time in air = 30/Ca = .15 - t
    solve for t
    Cw t = 2 d

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    Try some of the Physics Tutorials:


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