Dolphins communicate using sound waves underwater. Suppose a dolphin emits a sound wave with frequency 660 Hz while traveling at a speed 60 km/h. A research boat studying dolphins has an underwater receiver on a long cable that is approximately the same depth as the dolphins. Determine the frequency of the wave received by the receiver in the case when: Note: speed of sound in sea water = 1530 m/s.
A) the ship is stationary in the water and the dolphin is moving toward the ship.
B) the dolphin continues to move toward the ship, but the ship starts moving toward the dolphin at 35 km/h.
C) the dolphin continues to move toward the ship, but the ship turns around and is now moving away from the dolphin at 35 km/h.