scientists are measuring 2 separate depths using sonar. point A takes 4 seconds to return. point b takes 8 seconds. how could the scientist find roughly the depth of the water? how do you know?

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

because if the tool that you are using is not balanced it there would be false mass.