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        6-12

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        Part of NOVA
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        Sound Waves Underwater: The Loch Ness Monster

        Because sound waves travel longer distances through liquids than do light waves, measuring devices use sound to determine depth and locate underwater objects. In this video segment, adapted from NOVA, sonar's strengths and limitations are on display as a team of enthusiasts and scientists attempt to find a mythical monster.

        Visit the program page here.

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