{"id":3914,"date":"2024-05-04T01:13:21","date_gmt":"2024-05-03T23:13:21","guid":{"rendered":"https:\/\/eva.louis-le-grand.net\/maths\/?p=3914"},"modified":"2024-07-09T15:31:40","modified_gmt":"2024-07-09T13:31:40","slug":"la-cerise-sur-le-gateau-qui-tourne","status":"publish","type":"post","link":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/2024\/05\/04\/la-cerise-sur-le-gateau-qui-tourne\/","title":{"rendered":"La cerise sur le g\u00e2teau qui tourne"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Impossible de faire l\u00e9viter &#8230;.en statique avec des aimants &#8230; <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">mais il y a d&rsquo;autres moyens.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"894\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/levitation-electrique-1024x894.jpg\" alt=\"\" class=\"wp-image-4200\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/levitation-electrique-1024x894.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/levitation-electrique-300x262.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/levitation-electrique-768x670.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/levitation-electrique.jpg 1456w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"539\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8235-1024x539.jpg\" alt=\"\" class=\"wp-image-4201\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8235-1024x539.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8235-300x158.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8235-768x404.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8235-1536x808.jpg 1536w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8235-2048x1077.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">mais avec un champ tournant on peut. Voici un agitateur magn\u00e9tique por m\u00e9langer l soupe dans un verre.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"527\" height=\"701\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/turbulent-1.gif\" alt=\"\" class=\"wp-image-4108\" style=\"width:650px;height:auto\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le potentiel tourne. On a bien une situation dynamique. On a \u00e9quilibre \u00e0 distance de l&rsquo;aimant motoris\u00e9 dans le socle de l&rsquo;agitateur magn\u00e9tique. Les forces qui s&rsquo;\u00e9quilibrent sont:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La force r\u00e9pulsive quand l&rsquo;aimant motoris\u00e9 du socle vient sous le barreau aimant\u00e9. Et que sont en face les aimants Nord du socle contre face Nord du barreau qui se repoussent. De m\u00eame que Sud-Sud. En effet le barreau aimant\u00e9 ne peut pas tourner aussi vite que l&rsquo;aimant motoris\u00e9 du socle \u00e0 cause de la viscosit\u00e9 du fluide, et l&rsquo;aimant du socle tourne bien plus vite si bien qu&rsquo;il n&rsquo;y a pas ad\u00e9quation entre les vitesses de rotation.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La force attractive lorsque le cot\u00e9 Face Sud de l&rsquo;aimant du socle arrive cette fois sous le cot\u00e9 face Nord du barreau aimant\u00e9.<\/li>\n\n\n\n<li>Le poids qui agit pendant la chute libre entre les impulsions magn\u00e9tiques ci-dessus et qui a tendance \u00e0 faire tomber le barreau aimant\u00e9 au fond du verre.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La force r\u00e9pulsive magn\u00e9tique est plus forte que la force attractive magn\u00e9tique car entre l&rsquo;intervention de ces deux forces, le barreau est tomb\u00e9 et s&rsquo;est rapproch\u00e9, et donc la valeur absolue de la force magn\u00e9tique a augment\u00e9. <\/p>\n\n\n\n<div style='border: 2px solid #8888AA; background: #DDDDFF; padding:8px;' ><img decoding=\"async\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2023\/10\/qui.png\" alt=\"\" class=\"wp-image-1120\" width=30 \/> <b>Recette<\/b><br>\nCette exp\u00e9rience est inspir\u00e9e d&rsquo;une exp\u00e9rience finaliste en 2024du concours pour lyc\u00e9en et coll\u00e9gien CG\u00e9nial. \nCe qui semble \u00eatre de l&rsquo;eau, est ici bien plus visqueux, et est de la glyc\u00e9rine (go\u00fbt sucr\u00e9 un peu comme du miel).\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pour immobiliser des atomes, on proc\u00e8de un peu de la m\u00eame mani\u00e8re avec un champ potentiel tournant comme ce g\u00e2teau.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1210\" height=\"1210\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/04\/hyperbole.gif\" alt=\"\" class=\"wp-image-3920\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pour fabriquer ce g\u00e2teau on peut s&rsquo;aider de mod\u00e8le, imprim\u00e9 en 3D:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"718\" height=\"1024\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-718x1024.jpg\" alt=\"\" class=\"wp-image-3915\" style=\"width:600px;height:auto\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-718x1024.jpg 718w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-210x300.jpg 210w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-768x1095.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-1077x1536.jpg 1077w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-1437x2048.jpg 1437w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4867-2-scaled.jpg 1796w\" sizes=\"auto, (max-width: 718px) 100vw, 718px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"762\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4868-2-1024x762.jpg\" alt=\"\" class=\"wp-image-3916\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4868-2-1024x762.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4868-2-300x223.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4868-2-768x571.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4868-2-1536x1142.jpg 1536w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4868-2-2048x1523.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"813\" height=\"1024\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-813x1024.jpg\" alt=\"\" class=\"wp-image-3917\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-813x1024.jpg 813w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-238x300.jpg 238w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-768x967.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-1220x1536.jpg 1220w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-1627x2048.jpg 1627w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/03\/IMG_4869-scaled.jpg 2033w\" sizes=\"auto, (max-width: 813px) 100vw, 813px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"989\" height=\"1024\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-989x1024.jpg\" alt=\"\" class=\"wp-image-4203\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-989x1024.jpg 989w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-290x300.jpg 290w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-768x795.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-1483x1536.jpg 1483w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-1978x2048.jpg 1978w\" sizes=\"auto, (max-width: 989px) 100vw, 989px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"838\" height=\"1024\" data-id=\"4205\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-25-838x1024.jpg\" alt=\"\" class=\"wp-image-4205\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-25-838x1024.jpg 838w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-25-245x300.jpg 245w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-25-768x939.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-25-1257x1536.jpg 1257w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-25-1676x2048.jpg 1676w\" sizes=\"auto, (max-width: 838px) 100vw, 838px\" \/><\/figure>\n<\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"719\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-3-1024x719.jpg\" alt=\"\" class=\"wp-image-4206\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-3-1024x719.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-3-300x211.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-3-768x539.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-3-1536x1079.jpg 1536w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-3-2048x1438.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"800\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-4-1024x800.jpg\" alt=\"\" class=\"wp-image-4207\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-4-1024x800.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-4-300x234.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-4-768x600.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-4-1536x1200.jpg 1536w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/hyperboloide-bleu-4-2048x1600.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div>\t<div id=\"woo3dv-viewer\" style=\"max-width:500px;max-height:500px;\">\r\n\t\t<div class=\"woo3dv-canvas-wrapper\">\r\n\t\t\t<canvas id=\"woo3dv-cv\" class=\"woo3dv-canvas woo3dv-canvas-border\" width=\"500\" height=\"500\"><\/canvas>\r\n\t\t\t<div id=\"woo3dv-file-loading\">\r\n\t\t\t\t<img decoding=\"async\" alt=\"Loading file\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/plugins\/woo-3d-viewer\/images\/ajax-loader.gif\">\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\r\n\t\t<div id=\"woo3dv-model-controls\">\r\n\t\t<ul id=\"woo3dv-model-controls-list\">\r\n\t\t<li><a href=\"javascript:void(0)\" onclick=\"woo3dvToggleFullScreen();\"><img decoding=\"async\" alt=\"Fullscreen\" title=\"Fullscreen\" id=\"woo3dv-controls-fullscreen\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/plugins\/woo-3d-viewer\/images\/fullscreen.png\"><\/a>\r\n\t\t<li><a href=\"javascript:void(0)\" onclick=\"woo3dvToggleWireframe();\"><img decoding=\"async\" alt=\"Wireframe\" title=\"Wireframe\" id=\"woo3dv-controls-wireframe\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/plugins\/woo-3d-viewer\/images\/wireframe.png\"><\/a>\r\n\t\t<li><a href=\"javascript:void(0)\" onclick=\"woo3dvZoomIn();\"><img decoding=\"async\" alt=\"Zoom In\" title=\"Zoom In\" id=\"woo3dv-controls-zoomin\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/plugins\/woo-3d-viewer\/images\/zoom_in.png\"><\/a>\r\n\t\t<li><a href=\"javascript:void(0)\" onclick=\"woo3dvZoomOut();\"><img decoding=\"async\" alt=\"Zoom Out\" title=\"Zoom Out\" id=\"woo3dv-controls-zoomout\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/plugins\/woo-3d-viewer\/images\/zoom_out.png\"><\/a>\r\n\t\t<li><a href=\"javascript:void(0)\" onclick=\"woo3dvToggleRotation();\"><img decoding=\"async\" alt=\"Rotation\" title=\"Rotation\" id=\"woo3dv-controls-rotation\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/plugins\/woo-3d-viewer\/images\/rotation.png\"><\/a>\r\n\t\t<li><a 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button.\t\t\t\t\t<li>Double-click to enter the fullscreen mode.\t\t\t\t\t<li>On mobile devices swipe to rotate.\t\t\t\t\t<li>On mobile devices pinch two fingers together or apart to adjust zoom.\t\t\t\t\t<li>On mobile devices 3 finger horizontal swipe performs panning.\t\t\t\t\t<li>On mobile devices 3 finger horizontal swipe performs panning.\t\t\t\t<\/ul>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t<\/div>\r\n\t\t<\/div>\r\n\r\n\t<input type=\"hidden\" id=\"woo3dv_model_url\" value=\"\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/01\/blanc-manger.stl\">\r\n\t<input type=\"hidden\" id=\"woo3dv_model_mtl\" value=\"\">\r\n\t<input type=\"hidden\" id=\"woo3dv_model_gif\" value=\"\">\r\n\r\n\r\n\t<input type=\"hidden\" id=\"woo3dv_upload_url\" value=\"\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/01\/\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_model_color\" value=\"0xff7f7f\">\r\n\t<input type=\"hidden\" id=\"woo3dv_model_shininess\" 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value=\"off\">\r\n\r\n\r\n\r\n\t<input type=\"hidden\" id=\"woo3dv_camera_position_x\" value=\"-92.61919912472933\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_camera_position_y\"  value=\"153.81599121093748\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_camera_position_z\"  value=\"-196.82581705127038\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_camera_lookat_x\" value=\"0.3476473357926626\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_camera_lookat_y\"  value=\"-0.5773502691896256\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_camera_lookat_z\"  value=\"0.7387881946694402\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_controls_target_x\" value=\"0\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_controls_target_y\" value=\"0\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_controls_target_z\" value=\"0\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_offset_z\"  value=\"9.304557124778512e-12\" \/>\r\n\r\n\r\n\t<input type=\"hidden\" id=\"woo3dv_show_fog\"  value=\"\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_show_grid\"  value=\"on\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_show_ground\"  value=\"on\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_show_shadow\"  value=\"off\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_background1\"  value=\"0xFFFFFF\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_background_transparency\"  value=\"off\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_ground_mirror\"  value=\"off\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_fog_color\"  value=\"0xFFFFFF\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_grid_color\"  value=\"0x898989\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_ground_color\"  value=\"0xaacbff\" \/>\r\n\t<input type=\"hidden\" id=\"woo3dv_auto_rotation\"  value=\"on\" \/>\r\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pla\u00e7ons alors une cerise au milieu du g\u00e2teau. Elle tient et ne tombe pas sur la celle de cheval. Si on ar\u00eate de faire tourner le g\u00e2teau, elle tombe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est ainsi qu&rsquo;on arrive \u00e0 immobiliser des atomes avec des lasers. Un atome qui ne bouge pas, c&rsquo;est un atome froid. En effet la temp\u00e9rature n&rsquo;est rien d&rsquo;autre que la vitesse moyenne des particules. Quand il fait chaud, les mol\u00e9cules de l&rsquo;air bougent plus vite, la vitesse du son dans l&rsquo;air va plus vite. On ne s&rsquo;en rend pas compte car ce n&rsquo;est pas du vent qu&rsquo;il s&rsquo;agit, mais des vitesses des mol\u00e9cules dans le lapse de temps qu&rsquo;elles ont avant de cogner une autre mol\u00e9cule de gaz. Et donc, nos atomes immobilis\u00e9s avec des lasers, c&rsquo;est ce qu&rsquo;il y a de plus froid dans l&rsquo;univers. Lorsqu&rsquo;un atome s&rsquo;\u00e9carte un peu de sa position d&rsquo;\u00e9quilibre selon un axe, il re\u00e7oit du laser une petite impulsion qui le remet \u00e0 sa place, un peu comme la cerise qui commencerait \u00e0 tomber sur le g\u00e2teau est imm\u00e9diatement remis \u00e0 sa place par la hauteur du g\u00e2teau potentiel qui remonte. L&rsquo;atome est donc pi\u00e9g\u00e9 immobile et froid.<\/p>\n\n\n\n<div style='border: 2px solid #8888AA; background: #DDDDFF; padding:8px;' ><img decoding=\"async\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2023\/10\/qui.png\" alt=\"\" class=\"wp-image-1120\" width=30 \/> <b>Recette<\/b><br>\nCette exp\u00e9rience au potentiel tournant est inspir\u00e9 d&rsquo;une exp\u00e9rience de la SFO (Soci\u00e9t\u00e9 Fran\u00e7aise d&rsquo;Optique), bien que non pr\u00e9sente dans les lights box de Mr Daussy.\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-1024x1024.jpg\" alt=\"\" class=\"wp-image-4075\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-1024x1024.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-300x300.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-150x150.jpg 150w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-768x767.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-1536x1534.jpg 1536w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7937-1-2-2048x2046.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"925\" height=\"1024\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7923-cube-hyperbole-925x1024.jpg\" alt=\"\" class=\"wp-image-4076\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7923-cube-hyperbole-925x1024.jpg 925w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7923-cube-hyperbole-271x300.jpg 271w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7923-cube-hyperbole-768x850.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7923-cube-hyperbole-1387x1536.jpg 1387w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7923-cube-hyperbole-1850x2048.jpg 1850w\" sizes=\"auto, (max-width: 925px) 100vw, 925px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"779\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7931-chips-1024x779.jpg\" alt=\"\" class=\"wp-image-4077\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7931-chips-1024x779.jpg 1024w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7931-chips-300x228.jpg 300w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7931-chips-768x584.jpg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7931-chips-1536x1168.jpg 1536w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/06\/IMG_7931-chips-2048x1558.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"911\" height=\"1024\" src=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8652-911x1024.jpeg\" alt=\"\" class=\"wp-image-4228\" srcset=\"https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8652-911x1024.jpeg 911w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8652-267x300.jpeg 267w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8652-768x863.jpeg 768w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8652-1367x1536.jpeg 1367w, https:\/\/eva.louis-le-grand.net\/maths\/wp-content\/uploads\/2024\/07\/IMG_8652-1823x2048.jpeg 1823w\" sizes=\"auto, (max-width: 911px) 100vw, 911px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">est ce la m\u00eame forme ?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Potentiel pour pi\u00e9geage<\/p>\n","protected":false},"author":1,"featured_media":4044,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe"],"_links":{"self":[{"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/posts\/3914","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/comments?post=3914"}],"version-history":[{"count":12,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/posts\/3914\/revisions"}],"predecessor-version":[{"id":4260,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/posts\/3914\/revisions\/4260"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/media\/4044"}],"wp:attachment":[{"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/media?parent=3914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/categories?post=3914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eva.louis-le-grand.net\/maths\/index.php\/wp-json\/wp\/v2\/tags?post=3914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}