A research vessel uses a SONAR device to determine the depth of the ocean floor. The device emits an ultrasonic pulse straight downward and detects the reflected signal after a time delay of 1.2s. The speed of these waves in seawater is 1500m s−1. Answer the following.
(a) Calculate the depth of the sea at that point.
(b) The ship then lowers the transmitter–receiver pair to a depth equal to half of the value obtained in part (a) and repeats the measurement. Find the new time interval between the emission and reception of the reflected pulse.