Couleurs – interaction lumi\u00e8re-mati\u00e8re<\/title>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/mathjax@3\/es5\/tex-mml-chtml.js\"><\/script>\n<style>\n:root{--bg:#fff7ed;--ink:#1f2937;--card:#fff;--red:#dc2626;--green:#16a34a;--blue:#2563eb;--violet:#7c3aed;--cyan:#0891b2;--amber:#d97706;--line:#fed7aa;--soft:#fffbeb}\n*{box-sizing:border-box}body{margin:0;font-family:Arial,system-ui,sans-serif;background:linear-gradient(135deg,#fff7ed,#eef6ff);color:var(--ink);line-height:1.55}.wrap{max-width:1180px;margin:auto;padding:24px}.hero{background:white;border:1px solid var(--line);border-radius:26px;padding:26px;box-shadow:0 16px 40px #0001}h1{margin:0;font-size:2.3rem;color:#7c2d12}h2{color:#7c2d12;border-left:6px solid #fb923c;padding-left:12px;margin-top:34px}h3{color:#1e3a8a}.btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.btn{padding:12px 16px;border-radius:999px;text-decoration:none;color:white;font-weight:700;background:#ea580c}.btn.alt{background:#1d4ed8}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}.card{background:white;border:1px solid #fed7aa;border-radius:20px;padding:18px;box-shadow:0 8px 20px #00000010}.formula{background:#fff7ed;border:1px solid #fdba74;border-radius:14px;padding:12px;margin:10px 0;font-size:1.1rem;text-align:center}.memo{background:#ecfeff;border-color:#67e8f9}.exo{background:#f8fafc;border-color:#cbd5e1}svg{max-width:100%;height:auto}.q{border-top:1px dashed #cbd5e1;padding:10px 0}details{background:#f8fafc;border-radius:12px;padding:12px;margin:8px 0}\n<\/style><\/head><body><div class=\"wrap\"><section class=\"hero\"><h1>Couleurs – interaction lumi\u00e8re-mati\u00e8re<\/h1><p><b>Premi\u00e8re sp\u00e9cialit\u00e9 physique-chimie<\/b> – \u0153il, synth\u00e8se additive, synth\u00e8se soustractive, absorption, diffusion, transmission, longueur d\u2019onde.<\/p><div class=\"btns\"><a class=\"btn\" href=\"https:\/\/pcwallis.malo.wf\/wp-content\/uploads\/2026\/05\/chapitre_couleurs_premiere_v1_cours_imprimable.pdf\">\ud83d\udcc4 Export PDF cours<\/a><a class=\"btn alt\" href=\"https:\/\/pcwallis.malo.wf\/wp-content\/uploads\/2026\/05\/chapitre_couleurs_premiere_v1_exercices_types.pdf\">\ud83e\uddea Export PDF exercices types<\/a><button class=\"btn\" onclick=\"lire()\">\ud83d\udd0a Lecture audio du cours<\/button><button class=\"btn alt\" onclick=\"speechSynthesis.cancel()\">\u23f9 Stop<\/button><\/div><\/section>\n<h2>1. L\u2019\u0153il et les couleurs<\/h2><div class=\"grid\"><div class=\"card\"><p>L\u2019\u0153il contient <b>3 types de c\u00f4nes<\/b> sensibles aux 3 lumi\u00e8res primaires <b>RVB<\/b> : rouge, vert, bleu.<\/p><p>Le cerveau interpr\u00e8te ensuite le m\u00e9lange des signaux re\u00e7us.<\/p><p class=\"formula\">RVB = Rouge + Vert + Bleu<\/p><\/div><div class=\"card\"><svg viewBox=\"0 0 420 220\"><line x1=\"45\" y1=\"180\" x2=\"390\" y2=\"180\" stroke=\"#111\"\/><line x1=\"45\" y1=\"180\" x2=\"45\" y2=\"20\" stroke=\"#111\"\/><text x=\"10\" y=\"20\">sensibilit\u00e9<\/text><text x=\"365\" y=\"205\">\u03bb (nm)<\/text><path d=\"M65 180 C90 120 115 60 145 180\" fill=\"none\" stroke=\"#2563eb\" stroke-width=\"4\"\/><path d=\"M130 180 C170 80 215 70 255 180\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"4\"\/><path d=\"M220 180 C255 80 310 70 350 180\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"4\"\/><text x=\"95\" y=\"195\">400<\/text><text x=\"305\" y=\"195\">800<\/text><text x=\"100\" y=\"55\" fill=\"#2563eb\">bleu<\/text><text x=\"190\" y=\"55\" fill=\"#16a34a\">vert<\/text><text x=\"290\" y=\"55\" fill=\"#dc2626\">rouge<\/text><\/svg><\/div><\/div>\n<h2>2. Synth\u00e8se additive : m\u00e9lange de lumi\u00e8res<\/h2><div class=\"card\"><p>C\u2019est le principe utilis\u00e9 dans les \u00e9crans vid\u00e9o. On additionne les lumi\u00e8res primaires pour reproduire les couleurs artificiellement.<\/p><div class=\"formula\">Rouge + Vert = Jaune | Rouge + Bleu = Magenta | Vert + Bleu = Cyan<\/div><svg viewBox=\"0 0 420 260\"><circle cx=\"170\" cy=\"105\" r=\"75\" fill=\"#ef4444\" fill-opacity=\".55\"\/><circle cx=\"250\" cy=\"105\" r=\"75\" fill=\"#22c55e\" fill-opacity=\".55\"\/><circle cx=\"210\" cy=\"175\" r=\"75\" fill=\"#3b82f6\" fill-opacity=\".55\"\/><text x=\"115\" y=\"100\">R<\/text><text x=\"285\" y=\"100\">V<\/text><text x=\"205\" y=\"220\">B<\/text><text x=\"200\" y=\"105\">J<\/text><text x=\"155\" y=\"165\">M<\/text><text x=\"252\" y=\"165\">C<\/text><text x=\"198\" y=\"145\" font-weight=\"bold\">Blanc<\/text><\/svg><p><b>Remarque :<\/b> l\u2019\u0153il ne per\u00e7oit pas r\u00e9ellement du jaune pur : il interpr\u00e8te le m\u00e9lange rouge + vert comme du jaune.<\/p><\/div>\n<h2>3. Synth\u00e8se soustractive : peintures, pigments, colorants<\/h2><div class=\"grid\"><div class=\"card\"><p>La synth\u00e8se soustractive utilise les peintures, encres et pigments.<\/p><p class=\"formula\">Primaires : Cyan, Jaune, Magenta<\/p><p>Chaque pigment absorbe une couleur et diffuse les autres.<\/p><\/div><div class=\"card\"><svg viewBox=\"0 0 420 260\"><circle cx=\"170\" cy=\"105\" r=\"75\" fill=\"#06b6d4\" fill-opacity=\".55\"\/><circle cx=\"250\" cy=\"105\" r=\"75\" fill=\"#facc15\" fill-opacity=\".55\"\/><circle cx=\"210\" cy=\"175\" r=\"75\" fill=\"#d946ef\" fill-opacity=\".55\"\/><text x=\"115\" y=\"100\">Cyan<\/text><text x=\"270\" y=\"100\">Jaune<\/text><text x=\"175\" y=\"225\">Magenta<\/text><text x=\"203\" y=\"105\">Vert<\/text><text x=\"150\" y=\"165\">Bleu<\/text><text x=\"250\" y=\"165\">Rouge<\/text><text x=\"205\" y=\"145\" font-weight=\"bold\">Noir<\/text><\/svg><\/div><\/div>\n<h2>4. Diffusion, absorption, transmission<\/h2><div class=\"grid\"><div class=\"card\"><h3>Objet color\u00e9<\/h3><p>Une peinture jaune absorbe sa couleur compl\u00e9mentaire, le bleu, et diffuse les autres couleurs.<\/p><p class=\"formula\">Objet jaune + lumi\u00e8re blanche \u2192 absorbe B ; diffuse R + V \u2192 jaune<\/p><\/div><div class=\"card\"><h3>Filtre color\u00e9<\/h3><p>Un filtre simple transmet certaines lumi\u00e8res et absorbe sa couleur compl\u00e9mentaire.<\/p><p class=\"formula\">Filtre jaune \u2192 absorbe B ; transmet R + V<\/p><\/div><div class=\"card\"><h3>Cas particulier<\/h3><p>Un objet jaune \u00e9clair\u00e9 uniquement en bleu para\u00eet noir, car il absorbe le bleu et ne re\u00e7oit pas de rouge ni de vert \u00e0 diffuser.<\/p><\/div><\/div>\n<h2>5. Rappel calcul de longueur d\u2019onde<\/h2><div class=\"card\"><p>La couleur d\u2019une lumi\u00e8re peut \u00eatre d\u00e9sign\u00e9e par sa longueur d\u2019onde.<\/p><p class=\"formula\">\\(\\lambda = \\dfrac{c}{f}\\) et \\(f = \\dfrac{c}{\\lambda}\\)<\/p><p>Avec \\(c = 3,0 \\times 10^8\\,\\mathrm{m\\cdot s^{-1}}\\). Attention : \\(1\\,\\mathrm{nm} = 10^{-9}\\,\\mathrm{m}\\).<\/p><\/div>\n<h2>Fiche m\u00e9mo<\/h2><div class=\"card memo\"><p><b>Additive<\/b> = lumi\u00e8res = RVB = \u00e9cran. <b>Soustractive<\/b> = pigments\/encres = CMJ = imprimante. <b>Objet color\u00e9<\/b> = absorbe la compl\u00e9mentaire et diffuse les autres. <b>Filtre<\/b> = absorbe la compl\u00e9mentaire et transmet les autres.<\/p><\/div>\n<h2>Exercices types int\u00e9gr\u00e9s<\/h2><div class=\"grid\"><div class=\"card exo\"><h3>Longueur d\u2019onde<\/h3><p>Une radiation a une fr\u00e9quence \\(f = 7,50 \\times 10^{14}\\,\\mathrm{Hz}\\). Calculer \\(\\lambda\\).<\/p><details><summary>Correction<\/summary><p>On part de \\(\\lambda = \\dfrac{c}{f}\\). Donc \\(\\lambda = \\dfrac{3,0 \\times 10^8}{7,50 \\times 10^{14}} = 4,00 \\times 10^{-7}\\,\\mathrm{m} = 400\\,\\mathrm{nm}\\).<\/p><\/details><\/div><div class=\"card exo\"><h3>Couleur d\u2019un filtre<\/h3><p>Un filtre absorbe autour de 470 nm. Quelle est sa couleur probable ?<\/p><details><summary>Correction<\/summary><p>470 nm correspond au bleu. S\u2019il absorbe le bleu, il transmet les autres couleurs et para\u00eet jaune, couleur compl\u00e9mentaire du bleu.<\/p><\/details><\/div><\/div>\n<h2>Quiz – petites questions de d\u00e9finition<\/h2><div class=\"card\"><div class=\"q\"><b>1.<\/b> Quelles sont les trois lumi\u00e8res primaires en synth\u00e8se additive ?<\/div><div class=\"q\"><b>2.<\/b> Quelles sont les trois couleurs primaires en synth\u00e8se soustractive ?<\/div><div class=\"q\"><b>3.<\/b> Que fait une peinture jaune avec la lumi\u00e8re bleue ?<\/div><div class=\"q\"><b>4.<\/b> Quelle formule relie \\(\\lambda\\), \\(c\\) et \\(f\\) ?<\/div><div class=\"q\"><b>5.<\/b> Quelle couleur obtient-on avec rouge + vert en lumi\u00e8re ?<\/div><\/div>\n<\/div><script>function lire(){const t=document.body.innerText; const u=new SpeechSynthesisUtterance(t); u.lang='fr-FR'; u.rate=.95; speechSynthesis.speak(u);}<\/script><\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p>Couleurs – interaction lumi\u00e8re-mati\u00e8re Couleurs – interaction lumi\u00e8re-mati\u00e8re Premi\u00e8re sp\u00e9cialit\u00e9 physique-chimie – \u0153il, synth\u00e8se additive, synth\u00e8se soustractive, absorption, diffusion, transmission, longueur d\u2019onde. \ud83d\udcc4 Export PDF cours\ud83e\uddea...<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-845","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages\/845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/comments?post=845"}],"version-history":[{"count":1,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages\/845\/revisions"}],"predecessor-version":[{"id":847,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages\/845\/revisions\/847"}],"wp:attachment":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/media?parent=845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":845,"date":"2026-05-28T14:20:38","date_gmt":"2026-05-28T12:20:38","guid":{"rendered":"https:\/\/pcwallis.malo.wf\/?page_id=845"},"modified":"2026-05-28T14:20:39","modified_gmt":"2026-05-28T12:20:39","slug":"couleurs","status":"publish","type":"page","link":"https:\/\/pcwallis.malo.wf\/index.php\/couleurs\/","title":{"rendered":"couleurs"},"content":{"rendered":"\n\nCouleurs – interaction lumi\u00e8re-mati\u00e8re<\/title>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/mathjax@3\/es5\/tex-mml-chtml.js\"><\/script>\n<style>\n:root{--bg:#fff7ed;--ink:#1f2937;--card:#fff;--red:#dc2626;--green:#16a34a;--blue:#2563eb;--violet:#7c3aed;--cyan:#0891b2;--amber:#d97706;--line:#fed7aa;--soft:#fffbeb}\n*{box-sizing:border-box}body{margin:0;font-family:Arial,system-ui,sans-serif;background:linear-gradient(135deg,#fff7ed,#eef6ff);color:var(--ink);line-height:1.55}.wrap{max-width:1180px;margin:auto;padding:24px}.hero{background:white;border:1px solid var(--line);border-radius:26px;padding:26px;box-shadow:0 16px 40px #0001}h1{margin:0;font-size:2.3rem;color:#7c2d12}h2{color:#7c2d12;border-left:6px solid #fb923c;padding-left:12px;margin-top:34px}h3{color:#1e3a8a}.btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.btn{padding:12px 16px;border-radius:999px;text-decoration:none;color:white;font-weight:700;background:#ea580c}.btn.alt{background:#1d4ed8}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}.card{background:white;border:1px solid #fed7aa;border-radius:20px;padding:18px;box-shadow:0 8px 20px #00000010}.formula{background:#fff7ed;border:1px solid #fdba74;border-radius:14px;padding:12px;margin:10px 0;font-size:1.1rem;text-align:center}.memo{background:#ecfeff;border-color:#67e8f9}.exo{background:#f8fafc;border-color:#cbd5e1}svg{max-width:100%;height:auto}.q{border-top:1px dashed #cbd5e1;padding:10px 0}details{background:#f8fafc;border-radius:12px;padding:12px;margin:8px 0}\n<\/style><\/head><body><div class=\"wrap\"><section class=\"hero\"><h1>Couleurs – interaction lumi\u00e8re-mati\u00e8re<\/h1><p><b>Premi\u00e8re sp\u00e9cialit\u00e9 physique-chimie<\/b> – \u0153il, synth\u00e8se additive, synth\u00e8se soustractive, absorption, diffusion, transmission, longueur d\u2019onde.<\/p><div class=\"btns\"><a class=\"btn\" href=\"https:\/\/pcwallis.malo.wf\/wp-content\/uploads\/2026\/05\/chapitre_couleurs_premiere_v1_cours_imprimable.pdf\">\ud83d\udcc4 Export PDF cours<\/a><a class=\"btn alt\" href=\"https:\/\/pcwallis.malo.wf\/wp-content\/uploads\/2026\/05\/chapitre_couleurs_premiere_v1_exercices_types.pdf\">\ud83e\uddea Export PDF exercices types<\/a><button class=\"btn\" onclick=\"lire()\">\ud83d\udd0a Lecture audio du cours<\/button><button class=\"btn alt\" onclick=\"speechSynthesis.cancel()\">\u23f9 Stop<\/button><\/div><\/section>\n<h2>1. L\u2019\u0153il et les couleurs<\/h2><div class=\"grid\"><div class=\"card\"><p>L\u2019\u0153il contient <b>3 types de c\u00f4nes<\/b> sensibles aux 3 lumi\u00e8res primaires <b>RVB<\/b> : rouge, vert, bleu.<\/p><p>Le cerveau interpr\u00e8te ensuite le m\u00e9lange des signaux re\u00e7us.<\/p><p class=\"formula\">RVB = Rouge + Vert + Bleu<\/p><\/div><div class=\"card\"><svg viewBox=\"0 0 420 220\"><line x1=\"45\" y1=\"180\" x2=\"390\" y2=\"180\" stroke=\"#111\"\/><line x1=\"45\" y1=\"180\" x2=\"45\" y2=\"20\" stroke=\"#111\"\/><text x=\"10\" y=\"20\">sensibilit\u00e9<\/text><text x=\"365\" y=\"205\">\u03bb (nm)<\/text><path d=\"M65 180 C90 120 115 60 145 180\" fill=\"none\" stroke=\"#2563eb\" stroke-width=\"4\"\/><path d=\"M130 180 C170 80 215 70 255 180\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"4\"\/><path d=\"M220 180 C255 80 310 70 350 180\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"4\"\/><text x=\"95\" y=\"195\">400<\/text><text x=\"305\" y=\"195\">800<\/text><text x=\"100\" y=\"55\" fill=\"#2563eb\">bleu<\/text><text x=\"190\" y=\"55\" fill=\"#16a34a\">vert<\/text><text x=\"290\" y=\"55\" fill=\"#dc2626\">rouge<\/text><\/svg><\/div><\/div>\n<h2>2. Synth\u00e8se additive : m\u00e9lange de lumi\u00e8res<\/h2><div class=\"card\"><p>C\u2019est le principe utilis\u00e9 dans les \u00e9crans vid\u00e9o. On additionne les lumi\u00e8res primaires pour reproduire les couleurs artificiellement.<\/p><div class=\"formula\">Rouge + Vert = Jaune | Rouge + Bleu = Magenta | Vert + Bleu = Cyan<\/div><svg viewBox=\"0 0 420 260\"><circle cx=\"170\" cy=\"105\" r=\"75\" fill=\"#ef4444\" fill-opacity=\".55\"\/><circle cx=\"250\" cy=\"105\" r=\"75\" fill=\"#22c55e\" fill-opacity=\".55\"\/><circle cx=\"210\" cy=\"175\" r=\"75\" fill=\"#3b82f6\" fill-opacity=\".55\"\/><text x=\"115\" y=\"100\">R<\/text><text x=\"285\" y=\"100\">V<\/text><text x=\"205\" y=\"220\">B<\/text><text x=\"200\" y=\"105\">J<\/text><text x=\"155\" y=\"165\">M<\/text><text x=\"252\" y=\"165\">C<\/text><text x=\"198\" y=\"145\" font-weight=\"bold\">Blanc<\/text><\/svg><p><b>Remarque :<\/b> l\u2019\u0153il ne per\u00e7oit pas r\u00e9ellement du jaune pur : il interpr\u00e8te le m\u00e9lange rouge + vert comme du jaune.<\/p><\/div>\n<h2>3. Synth\u00e8se soustractive : peintures, pigments, colorants<\/h2><div class=\"grid\"><div class=\"card\"><p>La synth\u00e8se soustractive utilise les peintures, encres et pigments.<\/p><p class=\"formula\">Primaires : Cyan, Jaune, Magenta<\/p><p>Chaque pigment absorbe une couleur et diffuse les autres.<\/p><\/div><div class=\"card\"><svg viewBox=\"0 0 420 260\"><circle cx=\"170\" cy=\"105\" r=\"75\" fill=\"#06b6d4\" fill-opacity=\".55\"\/><circle cx=\"250\" cy=\"105\" r=\"75\" fill=\"#facc15\" fill-opacity=\".55\"\/><circle cx=\"210\" cy=\"175\" r=\"75\" fill=\"#d946ef\" fill-opacity=\".55\"\/><text x=\"115\" y=\"100\">Cyan<\/text><text x=\"270\" y=\"100\">Jaune<\/text><text x=\"175\" y=\"225\">Magenta<\/text><text x=\"203\" y=\"105\">Vert<\/text><text x=\"150\" y=\"165\">Bleu<\/text><text x=\"250\" y=\"165\">Rouge<\/text><text x=\"205\" y=\"145\" font-weight=\"bold\">Noir<\/text><\/svg><\/div><\/div>\n<h2>4. Diffusion, absorption, transmission<\/h2><div class=\"grid\"><div class=\"card\"><h3>Objet color\u00e9<\/h3><p>Une peinture jaune absorbe sa couleur compl\u00e9mentaire, le bleu, et diffuse les autres couleurs.<\/p><p class=\"formula\">Objet jaune + lumi\u00e8re blanche \u2192 absorbe B ; diffuse R + V \u2192 jaune<\/p><\/div><div class=\"card\"><h3>Filtre color\u00e9<\/h3><p>Un filtre simple transmet certaines lumi\u00e8res et absorbe sa couleur compl\u00e9mentaire.<\/p><p class=\"formula\">Filtre jaune \u2192 absorbe B ; transmet R + V<\/p><\/div><div class=\"card\"><h3>Cas particulier<\/h3><p>Un objet jaune \u00e9clair\u00e9 uniquement en bleu para\u00eet noir, car il absorbe le bleu et ne re\u00e7oit pas de rouge ni de vert \u00e0 diffuser.<\/p><\/div><\/div>\n<h2>5. Rappel calcul de longueur d\u2019onde<\/h2><div class=\"card\"><p>La couleur d\u2019une lumi\u00e8re peut \u00eatre d\u00e9sign\u00e9e par sa longueur d\u2019onde.<\/p><p class=\"formula\">\\(\\lambda = \\dfrac{c}{f}\\) et \\(f = \\dfrac{c}{\\lambda}\\)<\/p><p>Avec \\(c = 3,0 \\times 10^8\\,\\mathrm{m\\cdot s^{-1}}\\). Attention : \\(1\\,\\mathrm{nm} = 10^{-9}\\,\\mathrm{m}\\).<\/p><\/div>\n<h2>Fiche m\u00e9mo<\/h2><div class=\"card memo\"><p><b>Additive<\/b> = lumi\u00e8res = RVB = \u00e9cran. <b>Soustractive<\/b> = pigments\/encres = CMJ = imprimante. <b>Objet color\u00e9<\/b> = absorbe la compl\u00e9mentaire et diffuse les autres. <b>Filtre<\/b> = absorbe la compl\u00e9mentaire et transmet les autres.<\/p><\/div>\n<h2>Exercices types int\u00e9gr\u00e9s<\/h2><div class=\"grid\"><div class=\"card exo\"><h3>Longueur d\u2019onde<\/h3><p>Une radiation a une fr\u00e9quence \\(f = 7,50 \\times 10^{14}\\,\\mathrm{Hz}\\). Calculer \\(\\lambda\\).<\/p><details><summary>Correction<\/summary><p>On part de \\(\\lambda = \\dfrac{c}{f}\\). Donc \\(\\lambda = \\dfrac{3,0 \\times 10^8}{7,50 \\times 10^{14}} = 4,00 \\times 10^{-7}\\,\\mathrm{m} = 400\\,\\mathrm{nm}\\).<\/p><\/details><\/div><div class=\"card exo\"><h3>Couleur d\u2019un filtre<\/h3><p>Un filtre absorbe autour de 470 nm. Quelle est sa couleur probable ?<\/p><details><summary>Correction<\/summary><p>470 nm correspond au bleu. S\u2019il absorbe le bleu, il transmet les autres couleurs et para\u00eet jaune, couleur compl\u00e9mentaire du bleu.<\/p><\/details><\/div><\/div>\n<h2>Quiz – petites questions de d\u00e9finition<\/h2><div class=\"card\"><div class=\"q\"><b>1.<\/b> Quelles sont les trois lumi\u00e8res primaires en synth\u00e8se additive ?<\/div><div class=\"q\"><b>2.<\/b> Quelles sont les trois couleurs primaires en synth\u00e8se soustractive ?<\/div><div class=\"q\"><b>3.<\/b> Que fait une peinture jaune avec la lumi\u00e8re bleue ?<\/div><div class=\"q\"><b>4.<\/b> Quelle formule relie \\(\\lambda\\), \\(c\\) et \\(f\\) ?<\/div><div class=\"q\"><b>5.<\/b> Quelle couleur obtient-on avec rouge + vert en lumi\u00e8re ?<\/div><\/div>\n<\/div><script>function lire(){const t=document.body.innerText; const u=new SpeechSynthesisUtterance(t); u.lang='fr-FR'; u.rate=.95; speechSynthesis.speak(u);}<\/script><\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p>Couleurs – interaction lumi\u00e8re-mati\u00e8re Couleurs – interaction lumi\u00e8re-mati\u00e8re Premi\u00e8re sp\u00e9cialit\u00e9 physique-chimie – \u0153il, synth\u00e8se additive, synth\u00e8se soustractive, absorption, diffusion, transmission, longueur d\u2019onde. \ud83d\udcc4 Export PDF cours\ud83e\uddea...<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-845","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages\/845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/comments?post=845"}],"version-history":[{"count":1,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages\/845\/revisions"}],"predecessor-version":[{"id":847,"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/pages\/845\/revisions\/847"}],"wp:attachment":[{"href":"https:\/\/pcwallis.malo.wf\/index.php\/wp-json\/wp\/v2\/media?parent=845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}