Question

An explorer boat uses a sonar system to determine the distances of objects under the sea. The transmitter sends an ultrasound pulse of 20 kHz towards the seabed and the reflected pulse is detected 0.48 s later by the system’s receiver. If the wavelength of the ultra sound is 0.070 m in sea water, calculate the depth of the sea at that location. 

Answer 1

$$h=0.5vt\\h=0.5\lambda ft\\h=0.5(0.07)(20000)(0.48)=336\ m$$