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            <video:title>Production of sound</video:title>
            <video:description>Sound is vibrating air. But how does the air start vibrating? Explore the intriguing science of sound waves and how they travel. Learn how speakers use oscillation to create sound, and discover why sound waves can transport energy without moving the medium itself. Uncover the mystery behind the difference in our voices in person and on recordings.</video:description>
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            <video:category>12.1 Sound is a form of energy &amp;amp; 12.2 Production of sound</video:category>
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