Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of about 55 kHz to navigate and find prey.
(a) Suppose a dolphin sends out a series of high-pitched clicks that are reflected back from the bottom of the ocean 86 m below. How much time elapses before the dolphin hears the echoes of the clicks? (The speed of sound in seawater is approximately 1530 m/s.)
(b) What is the wavelength of 55.3 kHz sound in the ocean?