Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales

Question

Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of about 54.5 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 71 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.) s (b) What is the wavelength of 54.5 kHz sound in the ocean? mm

Explanation / Answer

(a)
Total Distance, = 2*71 = 142 m
v = 1530 m/s

t = Distance/Speed
t = 142/1530 s
t = 0.093 s


(b)
= v/f
= 1530 / (54.5 * 10^3)
= 0.02807 m
= 20.07 mm

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