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12. Sound
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Q26 of 50 Page 12

Define the following terms:

(1) Echolocation


(2) Echocardiography, and


(3) Ultrasonography.

(1) Echolocation is the technique by which objects are located by sensing time of echo of the sound emitted

(2) Formation of image of the heart by reflection of ultrasound from heart IS called echocardiography.


(3) Creating images of different parts of the body by means of reflection of ultrasound is called Ultrasonography.

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A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

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A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Giving g = 10 ms-2 and speed of sound = 340 ms-1.

27

Define the terms ‘frequency’, ‘wavelength’ and ‘velocity’ of a sound wave. What is the relation between them?

28

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Questions · 50
12. Sound
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