SONARs are devices typically used in fishing boats. SONAR stands for Sound NAvigation Ranging, and a sonar device sends pulses of sound waves down through the water. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. A stationary boat has a SONAR attached that is producing sound pulses at a frequency of f = 574.3 kHz. A fish is swimming towards the SONAR with a speed of v = 68.0 km/h. What is the SONAR frequency that the fish will detect? fHz v km/h Figure 1. Boat with a SONAR. Note that the speed of sound in water is 1480 m/s. f= kHz Part 3) If the pulse is reflected off the fish towards the boat, what will be the difference in the frequency that the SONAR detects as the frequency of the incoming pulse and the frequency of the pulse that the SONAR produces? Af = fincoming pulse - fSONAR kHz