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      <title>Signal lumineux et signal sonore by Mme Nieto</title>
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      <description>Cycle 4</description>
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      <pubDate>2018-05-23 13:38:19 UTC</pubDate>
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         <title>Signal lumineux</title>
         <author>madamenieto</author>
         <link>https://padlet.com/madamenieto/signaux/wish/263026087</link>
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         <pubDate>2018-05-23 13:42:04 UTC</pubDate>
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         <title>Signal sonore</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:42:17 UTC</pubDate>
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         <title>FIN DU PADLET</title>
         <author>madamenieto</author>
         <link>https://padlet.com/madamenieto/signaux/wish/263026264</link>
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         <pubDate>2018-05-23 13:42:30 UTC</pubDate>
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         <title>Éruption d&#39;un VOLCAN</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:44:41 UTC</pubDate>
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         <title>A quelle distance du volcan se trouve le tourisme ?</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:45:22 UTC</pubDate>
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         <title>Exercice 2 : Distance Terre/Lune</title>
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         <pubDate>2018-05-23 13:46:59 UTC</pubDate>
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         <title>Exercice 1 : Vitesse de la lumière</title>
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         <pubDate>2018-05-23 13:47:37 UTC</pubDate>
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         <title>Exercice 4 : Distance de l&#39;orage</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:49:29 UTC</pubDate>
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         <title>Exercice 5 : Vitesse du son</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:50:51 UTC</pubDate>
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         <title>Exercice 6 : Milieux de propagation</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:52:08 UTC</pubDate>
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         <title>Exercice 7 : L&#39;eau et l&#39;air</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 13:53:52 UTC</pubDate>
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         <title>Les années-lumières</title>
         <author>madamenieto</author>
         <link>https://padlet.com/madamenieto/signaux/wish/263032185</link>
         <description><![CDATA[<ol><li>Une année lumière exprime une distance. Exprimer-la en km.</li><li>Réécrire le résultat en écriture scientifique ( ex : 451 s’écrit 4,51 × 10<sup>2</sup> ) .&nbsp;</li><li>Calculer la distance (en année-lumière) qui nous sépare de l'étoile Proxima du Centaure.</li><li>Comment s'appelle notre Galaxie ? Qu'y a-t-il dans le carré jaune sur l'image ci-contre ?</li></ol><div><br></div>]]></description>
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         <pubDate>2018-05-23 13:56:19 UTC</pubDate>
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         <title>Une année-lumière</title>
         <author>madamenieto</author>
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         <description><![CDATA[]]></description>
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         <pubDate>2018-05-23 13:57:38 UTC</pubDate>
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         <title>1 a.l. = 1 an x vitesse de la lumière</title>
         <author>madamenieto</author>
         <link>https://padlet.com/madamenieto/signaux/wish/263032898</link>
         <description><![CDATA[]]></description>
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         <pubDate>2018-05-23 13:58:09 UTC</pubDate>
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         <title></title>
         <author>madamenieto</author>
         <link>https://padlet.com/madamenieto/signaux/wish/263033285</link>
         <description><![CDATA[<ul><li>L'étoile la plus proche de nous est Proxima du Centaure qui se trouve à  « seulement » 40 000 milliards de km. </li><li>En astronomie, les distances, qui sont extrêmement grandes, sont mesurées en années-lumière (a.l.) : c'est la distance que parcourt la lumière en une année :</li></ul><div><br></div>]]></description>
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         <pubDate>2018-05-23 13:59:04 UTC</pubDate>
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         <title>Proxima du Centaure</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 14:01:30 UTC</pubDate>
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         <title>Notre galaxie</title>
         <author>madamenieto</author>
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         <pubDate>2018-05-23 14:03:58 UTC</pubDate>
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