Post a New Question

Physics

posted by on .

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)
    then
    time in air = 30/Ca = .15 - t
    solve for t
    then
    Cw t = 2 d

  • Physics - ,

    Try some of the Physics Tutorials:

    http://search.yahoo.com/search?fr=mcafee&p=Physics+tutorial

    Sra

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question