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            <description><![CDATA[Test de connaissances sur les sources, les convertisseurs et les formes d'énergie. Attention ! petite boulette : le gateau stocke de l'énergie chimique (comme ce qui est dit et pas comme cela est écrit)]]></description>
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Attention ! petite boulette : le gateau stocke de l'énergie chimique (comme ce qui est dit et pas comme cela est écrit)</p>
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            <pubDate>Sat, 18 Apr 2026 12:36:26 GMT</pubDate>
            <description><![CDATA[Exercice sur une chaine d'énergie, fonctionnement d'une douche solaire.]]></description>
            <content:encoded><![CDATA[<p>Exercice sur une chaine d'énergie, fonctionnement d'une douche solaire.</p>
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            <title><![CDATA[Signal périodique, motif élémentaire et période]]></title>
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            <description><![CDATA[Dans cette vidéo, vous allez apprendre à identifier un signal périodique, à repérer un motif élémentaire afin de connaître sa période. Programme 2nd : 📝 Thème : Ondes et signaux. Partie : Émission et perception d’un son. ✔️Définir et dét...]]></description>
            <content:encoded><![CDATA[<p>Dans cette vidéo, vous allez apprendre à identifier un signal périodique, à repérer un motif élémentaire afin de connaître sa période.</p>
<p>Programme 2nd :<br />
📝 Thème : Ondes et signaux.<br />
Partie : Émission et perception d’un son.<br />
✔️Définir et déterminer la période d’un signal sonore notamment à partir de sa représentation temporelle.</p>
<p>Retrouvez d'autres vidéos et des fiches méthodologiques à télécharger gratuitement :<br />
<a href="https://eprofs.fr" target="_blank" rel="noopener noreferrer">https://eprofs.fr</a></p>
<p>Twitter : <a href="https://twitter.com/e_profs" target="_blank" rel="noopener noreferrer">https://twitter.com/e_profs</a><br />
Instagram : <a href="https://www.instagram.com/e_profs_physique_chimie/" target="_blank" rel="noopener noreferrer">https://www.instagram.com/e_profs_physique_chimie/</a><br />
Facebook : <a href="https://www.facebook.com/E-profs-467482426970398/" target="_blank" rel="noopener noreferrer">https://www.facebook.com/E-profs-467482426970398/</a></p>
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            <dc:creator>cours 2nd</dc:creator>
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