A sonar generator on a ship produces periodic ultrasonic waves at a frequency of 2.3 MHz. The wavelength of the waves in sea water is 4.9 · 10-4 m. When the generator is directed downward, an echo is received 16.2 s later. How deep is the ocean in m? Frequency=1/T Velocity=wavelength/T= frequency * wavelength Wave motion towards +x y=Asin (2*pi*frequency*time-2*pi*x/wavelength) This echo goes down in and hits the ocean floor and then comes back up. The distance may be multipled by 2. I want to use the wave motion but A is not given and none of my formulas help me solve for A. so I would say y=Asin *(plug in everything except for x?) And try to solve for x but I have no idea how I go about this. Any help?