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Echoes and their use in sonar
An introduction to echoes and how they are used in sonar to locate objects under water. The presenter explains how sound travels through solids and liquids as particles vibrate. However, when sound comes into contact with hard flat surfaces some of it is reflected - this is called an echo. Sonar, a sophisticated technique using this principle, is used at sea to locate the sea bottom and other large objects in the water.
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