A submarine sends out a sonar pulse that is reflected from the ocean floor directly below it. The echo is received 1.60s after the pulse is emitted. Assume the speed of sound in sea water to be 1500m/s.
(i) State the relation connecting distance travelled, speed and time for the pulse.
(ii) Calculate the depth of the ocean at the point directly beneath the submarine.
(iii) The same equipment emits a second pulse of frequency 40kHz. Find the wavelength of this ultrasonic pulse in sea water.