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 55 kHz to navigate and find prey.

Part A

Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 65m 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.)

Express your answer using two significant figures.

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Part B

What is the wavelength of 55 kHz sound in the ocean?

Express your answer using two significant figures.

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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.

Part A

Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 65m 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.)

Express your answer using two significant figures.

t = s

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Part B

What is the wavelength of 55 kHz sound in the ocean?

Express your answer using two significant figures.

? = mm

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Explanation / Answer

1)

Time taken to hear the echo, t = 2 d / V
                                              = 2*65/1530 = 0.085 s

2)

speed = frequency *lambda
lambda = speed/frequency
lambda = 1530m/s/55000Hz
lambda = 27.82 mm

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