{"id":5156,"date":"2025-06-07T09:31:52","date_gmt":"2025-06-07T09:31:52","guid":{"rendered":"https:\/\/diznr.com\/?p=5156"},"modified":"2025-06-07T09:31:52","modified_gmt":"2025-06-07T09:31:52","slug":"physics-class-12-notes-light-wave-optics-nuclei-electromagnetic-semiconductor","status":"publish","type":"post","link":"https:\/\/www.reilsolar.com\/pdf\/physics-class-12-notes-light-wave-optics-nuclei-electromagnetic-semiconductor\/","title":{"rendered":"Physics Class 12 Notes Light Wave ,Optics Nuclei ,Semiconductor ,Electromagnetic"},"content":{"rendered":"<div id=\"pl-5156\" class=\"panel-layout\">\n<div id=\"pg-5156-0\" class=\"panel-grid panel-no-style\">\n<div id=\"pgc-5156-0-0\" class=\"panel-grid-cell\" data-weight=\"1\">\n<div id=\"panel-5156-0-0-0\" class=\"so-panel widget widget_black-studio-tinymce widget_black_studio_tinymce panel-first-child\" data-index=\"0\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"textwidget\">\n<div style=\"width: 750px;height: 842px\">\n<div style=\"width: 80px;height: 80px;opacity: 0\">&nbsp;<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-5156-0-0-1\" class=\"so-panel widget widget_black-studio-tinymce widget_black_studio_tinymce panel-last-child\" data-index=\"1\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"textwidget\">\n<h3 data-start=\"0\" data-end=\"51\"><strong data-start=\"4\" data-end=\"49\">Physics Class 12 Notes \u2013 Important Topics<\/strong><\/h3>\n<h4 data-start=\"53\" data-end=\"92\"><strong data-start=\"58\" data-end=\"90\">1. Wave Optics (Light Waves)<\/strong><\/h4>\n<ul data-start=\"93\" data-end=\"401\">\n<li data-start=\"93\" data-end=\"156\"><strong data-start=\"95\" data-end=\"117\">Huygens&#8217; Principle<\/strong> \u2013 Explains the wave nature of light.<\/li>\n<li data-start=\"157\" data-end=\"253\"><strong data-start=\"159\" data-end=\"175\">Interference<\/strong> \u2013 Constructive &amp; destructive interference (Young&#8217;s Double-Slit Experiment).<\/li>\n<li data-start=\"254\" data-end=\"335\"><strong data-start=\"256\" data-end=\"271\">Diffraction<\/strong> \u2013 Bending of light around obstacles (Single-Slit Experiment).<\/li>\n<li data-start=\"336\" data-end=\"401\"><strong data-start=\"338\" data-end=\"354\">Polarization<\/strong> \u2013 Light waves oscillating in a single plane.<\/li>\n<\/ul>\n<h4 data-start=\"403\" data-end=\"427\"><strong data-start=\"408\" data-end=\"425\">2. Ray Optics<\/strong><\/h4>\n<ul data-start=\"428\" data-end=\"724\">\n<li data-start=\"428\" data-end=\"510\"><strong data-start=\"430\" data-end=\"457\">Reflection &amp; Refraction<\/strong> \u2013 Laws of reflection and refraction (Snell&#8217;s Law).<\/li>\n<li data-start=\"511\" data-end=\"589\"><strong data-start=\"513\" data-end=\"538\">Mirror &amp; Lens Formula<\/strong> \u2013 <span class=\"katex\"><span class=\"katex-mathml\">1f=1v\u22121u\\frac{1}{f} = \\frac{1}{v} &#8211; \\frac{1}{u}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">f<\/span><\/span><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">v<\/span><\/span><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">u<\/span><\/span><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>.<\/li>\n<li data-start=\"590\" data-end=\"664\"><strong data-start=\"592\" data-end=\"621\">Total Internal Reflection<\/strong> \u2013 Optical fibers work on this principle.<\/li>\n<li data-start=\"665\" data-end=\"724\"><strong data-start=\"667\" data-end=\"684\">Power of Lens<\/strong> \u2013 <span class=\"katex\"><span class=\"katex-mathml\">P=100fP = \\frac{100}{f}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">P<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">f<\/span><\/span><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">100<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> (Diopters).<\/li>\n<\/ul>\n<h4 data-start=\"726\" data-end=\"746\"><strong data-start=\"731\" data-end=\"744\">3. Nuclei<\/strong><\/h4>\n<ul data-start=\"747\" data-end=\"1000\">\n<li data-start=\"747\" data-end=\"800\"><strong data-start=\"749\" data-end=\"775\">Nuclear Binding Energy<\/strong> \u2013 Stability of nuclei.<\/li>\n<li data-start=\"801\" data-end=\"854\"><strong data-start=\"803\" data-end=\"820\">Radioactivity<\/strong> \u2013 Alpha, Beta, and Gamma Decay.<\/li>\n<li data-start=\"855\" data-end=\"916\"><strong data-start=\"857\" data-end=\"882\">Half-Life &amp; Decay Law<\/strong> \u2013 <span class=\"katex\"><span class=\"katex-mathml\">N=N0e\u2212\u03bbtN = N_0 e^{-\\lambda t}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">N<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">N<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">0<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mord\"><span class=\"mord mathnormal\">e<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">\u2212<span class=\"mord mathnormal mtight\">\u03bb<\/span><span class=\"mord mathnormal mtight\">t<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>.<\/li>\n<li data-start=\"917\" data-end=\"1000\"><strong data-start=\"919\" data-end=\"947\">Nuclear Fission &amp; Fusion<\/strong> \u2013 Energy production in stars and nuclear reactors.<\/li>\n<\/ul>\n<h4 data-start=\"1002\" data-end=\"1041\"><strong data-start=\"1007\" data-end=\"1039\">4. Semiconductor Electronics<\/strong><\/h4>\n<ul data-start=\"1042\" data-end=\"1271\">\n<li data-start=\"1042\" data-end=\"1116\"><strong data-start=\"1044\" data-end=\"1071\">Types of Semiconductors<\/strong> \u2013 Intrinsic &amp; Extrinsic (n-type &amp; p-type).<\/li>\n<li data-start=\"1117\" data-end=\"1219\"><strong data-start=\"1119\" data-end=\"1143\">Diodes &amp; Transistors<\/strong> \u2013 PN Junction Diode, LED, Zener Diode, Bipolar Junction Transistor (BJT).<\/li>\n<li data-start=\"1220\" data-end=\"1271\"><strong data-start=\"1222\" data-end=\"1237\">Logic Gates<\/strong> \u2013 AND, OR, NOT, NAND, NOR, XOR.<\/li>\n<\/ul>\n<h4 data-start=\"1273\" data-end=\"1308\"><strong data-start=\"1278\" data-end=\"1306\">5. Electromagnetic Waves<\/strong><\/h4>\n<ul data-start=\"1309\" data-end=\"1565\">\n<li data-start=\"1309\" data-end=\"1386\"><strong data-start=\"1311\" data-end=\"1334\">Maxwell&#8217;s Equations<\/strong> \u2013 Predict the existence of electromagnetic waves.<\/li>\n<li data-start=\"1387\" data-end=\"1479\"><strong data-start=\"1389\" data-end=\"1413\">Spectrum of EM Waves<\/strong> \u2013 Radio, Microwaves, Infrared, Visible, UV, X-rays, Gamma Rays.<\/li>\n<li data-start=\"1480\" data-end=\"1565\"><strong data-start=\"1482\" data-end=\"1502\">Uses of EM Waves<\/strong> \u2013 Communication, medical imaging, and industry applications.<\/li>\n<\/ul>\n<p data-start=\"1567\" data-end=\"1649\" data-is-last-node=\"\" data-is-only-node=\"\">Would you like <strong data-start=\"1582\" data-end=\"1625\">detailed notes, formulas, or numericals<\/strong> on a specific topic?<\/p>\n<p data-start=\"0\" data-end=\"128\">Here\u2019s a <strong data-start=\"9\" data-end=\"64\">compact and clear summary of Class 12 Physics Notes<\/strong> for the topics you mentioned, based on NCERT and CBSE syllabus:<\/p>\n<hr data-start=\"130\" data-end=\"133\" \/>\n<h2 data-start=\"135\" data-end=\"177\">\ud83d\udd26 <strong data-start=\"141\" data-end=\"177\">1. Wave Optics (Light as a Wave)<\/strong><\/h2>\n<h3 data-start=\"179\" data-end=\"199\">\ud83d\udcd8 Key Concepts:<\/h3>\n<ul data-start=\"200\" data-end=\"581\">\n<li data-start=\"200\" data-end=\"292\">\n<p data-start=\"202\" data-end=\"292\"><strong data-start=\"202\" data-end=\"224\">Huygens&#8217; Principle<\/strong>: Every point on a wavefront acts as a source of secondary wavelets.<\/p>\n<\/li>\n<li data-start=\"293\" data-end=\"456\">\n<p data-start=\"295\" data-end=\"355\"><strong data-start=\"295\" data-end=\"311\">Interference<\/strong>: Superposition of two coherent light waves.<\/p>\n<ul data-start=\"358\" data-end=\"456\">\n<li data-start=\"358\" data-end=\"456\">\n<p data-start=\"360\" data-end=\"410\"><em data-start=\"360\" data-end=\"392\">Young\u2019s Double Slit Experiment<\/em> \u2013 Fringe width:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">\u03b2=\u03bbDd\\beta = \\frac{\\lambda D}{d}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">\u03b2<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">d<\/span><span class=\"mord mathnormal\">\u03bb<\/span><span class=\"mord mathnormal\">D<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li data-start=\"457\" data-end=\"519\">\n<p data-start=\"459\" data-end=\"519\"><strong data-start=\"459\" data-end=\"474\">Diffraction<\/strong>: Bending of light around edges or obstacles.<\/p>\n<\/li>\n<li data-start=\"520\" data-end=\"581\">\n<p data-start=\"522\" data-end=\"581\"><strong data-start=\"522\" data-end=\"538\">Polarisation<\/strong>: Light waves oscillating in one direction.<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"583\" data-end=\"586\" \/>\n<h2 data-start=\"588\" data-end=\"632\">\ud83d\udd0d <strong data-start=\"594\" data-end=\"632\">2. Ray Optics (Geometrical Optics)<\/strong><\/h2>\n<h3 data-start=\"634\" data-end=\"654\">\ud83d\udcd8 Key Concepts:<\/h3>\n<ul data-start=\"655\" data-end=\"1051\">\n<li data-start=\"655\" data-end=\"757\">\n<p data-start=\"657\" data-end=\"707\"><strong data-start=\"657\" data-end=\"671\">Reflection<\/strong> and <strong data-start=\"676\" data-end=\"690\">Refraction<\/strong> (Snell&#8217;s Law):<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">n1sin\u2061\u03b81=n2sin\u2061\u03b82n_1 \\sin \\theta_1 = n_2 \\sin \\theta_2<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mop\">sin<\/span><span class=\"mord\"><span class=\"mord mathnormal\">\u03b8<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mop\">sin<\/span><span class=\"mord\"><span class=\"mord mathnormal\">\u03b8<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<li data-start=\"758\" data-end=\"943\">\n<p data-start=\"760\" data-end=\"785\"><strong data-start=\"760\" data-end=\"782\">Lenses and Mirrors<\/strong>:<\/p>\n<ul data-start=\"788\" data-end=\"943\">\n<li data-start=\"788\" data-end=\"865\">\n<p data-start=\"790\" data-end=\"807\">Mirror Formula:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">1f=1v+1u\\frac{1}{f} = \\frac{1}{v} + \\frac{1}{u}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">f<\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">v<\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mbin\">+<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">u<\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<li data-start=\"868\" data-end=\"943\">\n<p data-start=\"870\" data-end=\"885\">Lens Formula:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">1f=1v\u22121u\\frac{1}{f} = \\frac{1}{v} &#8211; \\frac{1}{u}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">f<\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">v<\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">u<\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li data-start=\"944\" data-end=\"981\">\n<p data-start=\"946\" data-end=\"981\"><strong data-start=\"946\" data-end=\"975\">Total Internal Reflection<\/strong> (TIR)<\/p>\n<\/li>\n<li data-start=\"982\" data-end=\"1051\">\n<p data-start=\"984\" data-end=\"1008\"><strong data-start=\"984\" data-end=\"1007\">Optical Instruments<\/strong>:<\/p>\n<ul data-start=\"1011\" data-end=\"1051\">\n<li data-start=\"1011\" data-end=\"1051\">\n<p data-start=\"1013\" data-end=\"1051\"><em data-start=\"1013\" data-end=\"1025\">Microscope<\/em>, <em data-start=\"1027\" data-end=\"1038\">Telescope<\/em>, <em data-start=\"1040\" data-end=\"1051\">Human Eye<\/em><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr data-start=\"1053\" data-end=\"1056\" \/>\n<h2 data-start=\"1058\" data-end=\"1077\">\u2622\ufe0f <strong data-start=\"1064\" data-end=\"1077\">3. Nuclei<\/strong><\/h2>\n<h3 data-start=\"1079\" data-end=\"1099\">\ud83d\udcd8 Key Concepts:<\/h3>\n<ul data-start=\"1100\" data-end=\"1410\">\n<li data-start=\"1100\" data-end=\"1140\">\n<p data-start=\"1102\" data-end=\"1140\"><strong data-start=\"1102\" data-end=\"1120\">Atomic Nucleus<\/strong>: Protons + Neutrons<\/p>\n<\/li>\n<li data-start=\"1141\" data-end=\"1222\">\n<p data-start=\"1143\" data-end=\"1187\"><strong data-start=\"1143\" data-end=\"1163\">Mass Defect (\u0394m)<\/strong> and <strong data-start=\"1168\" data-end=\"1186\">Binding Energy<\/strong>:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">E=\u0394m\u22c5c2E = \\Delta m \\cdot c^2<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">E<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\">\u0394<\/span><span class=\"mord mathnormal\">m<\/span><span class=\"mbin\">\u22c5<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">c<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<li data-start=\"1223\" data-end=\"1342\">\n<p data-start=\"1225\" data-end=\"1243\"><strong data-start=\"1225\" data-end=\"1242\">Radioactivity<\/strong>:<\/p>\n<ul data-start=\"1246\" data-end=\"1342\">\n<li data-start=\"1246\" data-end=\"1284\">\n<p data-start=\"1248\" data-end=\"1284\">Alpha (\u03b1), Beta (\u03b2), Gamma (\u03b3) Decay<\/p>\n<\/li>\n<li data-start=\"1287\" data-end=\"1342\">\n<p data-start=\"1289\" data-end=\"1301\">Decay Law:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">N=N0e\u2212\u03bbtN = N_0 e^{-\\lambda t}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">N<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">N<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">0<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mord\"><span class=\"mord mathnormal\">e<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">\u2212<span class=\"mord mathnormal mtight\">\u03bb<\/span><span class=\"mord mathnormal mtight\">t<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li data-start=\"1343\" data-end=\"1410\">\n<p data-start=\"1345\" data-end=\"1366\"><strong data-start=\"1345\" data-end=\"1363\">Half-life (T\u00bd)<\/strong>:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">T1\/2=0.693\u03bbT_{1\/2} = \\frac{0.693}{\\lambda}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">T<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1\/2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">\u03bb<\/span>0.693<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<hr data-start=\"1412\" data-end=\"1415\" \/>\n<h2 data-start=\"1417\" data-end=\"1458\">\ud83d\udca1 <strong data-start=\"1423\" data-end=\"1458\">4. Semiconductors (Electronics)<\/strong><\/h2>\n<h3 data-start=\"1460\" data-end=\"1480\">\ud83d\udcd8 Key Concepts:<\/h3>\n<ul data-start=\"1481\" data-end=\"1716\">\n<li data-start=\"1481\" data-end=\"1535\">\n<p data-start=\"1483\" data-end=\"1535\"><strong data-start=\"1483\" data-end=\"1492\">Types<\/strong>: Intrinsic and Extrinsic (p-type &amp; n-type)<\/p>\n<\/li>\n<li data-start=\"1536\" data-end=\"1595\">\n<p data-start=\"1538\" data-end=\"1595\"><strong data-start=\"1538\" data-end=\"1547\">Diode<\/strong>: Allows current in one direction (Forward Bias)<\/p>\n<\/li>\n<li data-start=\"1596\" data-end=\"1664\">\n<p data-start=\"1598\" data-end=\"1664\"><strong data-start=\"1598\" data-end=\"1626\">Transistor (n-p-n\/p-n-p)<\/strong>: Used for amplification and switching<\/p>\n<\/li>\n<li data-start=\"1665\" data-end=\"1716\">\n<p data-start=\"1667\" data-end=\"1683\"><strong data-start=\"1667\" data-end=\"1682\">Logic Gates<\/strong>:<\/p>\n<ul data-start=\"1686\" data-end=\"1716\">\n<li data-start=\"1686\" data-end=\"1716\">\n<p data-start=\"1688\" data-end=\"1716\">AND, OR, NOT, NAND, NOR, XOR<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<blockquote data-start=\"1718\" data-end=\"1824\">\n<p data-start=\"1720\" data-end=\"1824\"><strong data-start=\"1720\" data-end=\"1741\">Important Formula<\/strong>:<br data-start=\"1742\" data-end=\"1745\" \/>Current in forward-biased diode \u2248 exponential<br data-start=\"1790\" data-end=\"1793\" \/>Reverse-biased diode \u2248 almost 0<\/p>\n<\/blockquote>\n<hr data-start=\"1826\" data-end=\"1829\" \/>\n<h2 data-start=\"1831\" data-end=\"1865\">\ud83c\udf10 <strong data-start=\"1837\" data-end=\"1865\">5. Electromagnetic Waves<\/strong><\/h2>\n<h3 data-start=\"1867\" data-end=\"1887\">\ud83d\udcd8 Key Concepts:<\/h3>\n<ul data-start=\"1888\" data-end=\"2144\">\n<li data-start=\"1888\" data-end=\"1952\">\n<p data-start=\"1890\" data-end=\"1952\"><strong data-start=\"1890\" data-end=\"1902\">EM Waves<\/strong>: Transverse waves of electric and magnetic fields<\/p>\n<\/li>\n<li data-start=\"1953\" data-end=\"2054\">\n<p data-start=\"1955\" data-end=\"1967\"><strong data-start=\"1955\" data-end=\"1964\">Speed<\/strong>:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">c=1\u03bc0\u03b50\u22483\u00d7108\u00a0m\/sc = \\frac{1}{\\sqrt{\\mu_0 \\varepsilon_0}} \\approx 3 \\times 10^8 \\text{ m\/s}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">c<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord sqrt\"><span class=\"svg-align\"><span class=\"mord mathnormal\">\u03bc<\/span><span class=\"msupsub\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">0<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"mord mathnormal\">\u03b5<\/span><span class=\"msupsub\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">0<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span>1<\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">\u2248<\/span><\/span><span class=\"base\"><span class=\"mord\">3<\/span><span class=\"mbin\">\u00d7<\/span><\/span><span class=\"base\"><span class=\"mord\">1<\/span><span class=\"mord\">0<span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">8<\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mord text\"><span class=\"mord\">\u00a0m\/s<\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<li data-start=\"2055\" data-end=\"2144\">\n<p data-start=\"2057\" data-end=\"2086\"><strong data-start=\"2057\" data-end=\"2085\">Electromagnetic Spectrum<\/strong>:<\/p>\n<ul data-start=\"2089\" data-end=\"2144\">\n<li data-start=\"2089\" data-end=\"2144\">\n<p data-start=\"2091\" data-end=\"2144\">Radio, Microwave, Infrared, Visible, UV, X-ray, Gamma<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div class=\"_tableContainer_16hzy_1\">\n<div class=\"_tableWrapper_16hzy_14 group flex w-fit flex-col-reverse\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2146\" data-end=\"2395\">\n<thead data-start=\"2146\" data-end=\"2195\">\n<tr data-start=\"2146\" data-end=\"2195\">\n<th data-start=\"2146\" data-end=\"2163\" data-col-size=\"sm\">Wave Type<\/th>\n<th data-start=\"2163\" data-end=\"2195\" data-col-size=\"sm\">Use<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"2246\" data-end=\"2395\">\n<tr data-start=\"2246\" data-end=\"2295\">\n<td data-start=\"2246\" data-end=\"2263\" data-col-size=\"sm\">Radio<\/td>\n<td data-start=\"2263\" data-end=\"2295\" data-col-size=\"sm\">Communication<\/td>\n<\/tr>\n<tr data-start=\"2296\" data-end=\"2345\">\n<td data-start=\"2296\" data-end=\"2313\" data-col-size=\"sm\">Infrared<\/td>\n<td data-col-size=\"sm\" data-start=\"2313\" data-end=\"2345\">Remote control, night vision<\/td>\n<\/tr>\n<tr data-start=\"2346\" data-end=\"2395\">\n<td data-start=\"2346\" data-end=\"2363\" data-col-size=\"sm\">X-ray<\/td>\n<td data-start=\"2363\" data-end=\"2395\" data-col-size=\"sm\">Medical imaging<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"sticky end-(--thread-content-margin) h-0 self-end select-none\">\n<div class=\"absolute end-0 flex items-end\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<hr data-start=\"2397\" data-end=\"2400\" \/>\n<h2 data-start=\"2402\" data-end=\"2445\">\ud83d\udcc4 Want PDF Notes or Practice Questions?<\/h2>\n<p data-start=\"2447\" data-end=\"2461\">I can provide:<\/p>\n<ul data-start=\"2462\" data-end=\"2601\">\n<li data-start=\"2462\" data-end=\"2506\">\n<p data-start=\"2464\" data-end=\"2506\">\ud83d\udcda Full <strong data-start=\"2472\" data-end=\"2506\">chapter-wise handwritten notes<\/strong><\/p>\n<\/li>\n<li data-start=\"2507\" data-end=\"2558\">\n<p data-start=\"2509\" data-end=\"2558\">\ud83e\uddea <strong data-start=\"2512\" data-end=\"2534\">Numerical formulas<\/strong> and <strong data-start=\"2539\" data-end=\"2558\">solved examples<\/strong><\/p>\n<\/li>\n<li data-start=\"2559\" data-end=\"2601\">\n<p data-start=\"2561\" data-end=\"2601\">\ud83d\udcd8 <strong data-start=\"2564\" data-end=\"2601\">MCQ and Assertion-Reason practice<\/strong><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2603\" data-end=\"2705\" data-is-last-node=\"\" data-is-only-node=\"\">Let me know your preferred <strong data-start=\"2630\" data-end=\"2640\">format<\/strong> (PDF, summary, practice sheet) or if you want this <strong data-start=\"2692\" data-end=\"2704\">in Hindi<\/strong>.<\/p>\n<h3 data-start=\"2603\" data-end=\"2705\"><a href=\"https:\/\/cdnbbsr.s3waas.gov.in\/s3kv01edb5f385049e35efd27c9a97d11f\/uploads\/2024\/06\/2024061474.pdf\" target=\"_blank\" rel=\"noopener\">Physics Class 12 Notes Light Wave ,Optics Nuclei ,Semiconductor ,Electromagnetic<\/a><\/h3>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Physics Class 12 Notes \u2013 Important Topics 1. Wave Optics (Light Waves) Huygens&#8217; Principle \u2013 Explains the wave nature of light. Interference \u2013 Constructive &amp; destructive interference (Young&#8217;s Double-Slit Experiment). Diffraction \u2013 Bending of light around obstacles (Single-Slit Experiment). Polarization \u2013 Light waves oscillating in a single plane. 2. Ray Optics Reflection &amp; Refraction [&hellip;]<\/p>\n","protected":false},"author":64,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1955],"tags":[1950,1951,1952,1953,1954,1956,1957,1958,1959,1960],"class_list":["post-5156","post","type-post","status-publish","format-standard","hentry","category-light-wave-optics-nuclei-semiconductor-electromagnetic","tag-diode","tag-electromagnetic","tag-electromagnetic-radiation","tag-electromagnetic-spectrum","tag-em-spectrum","tag-mosfet","tag-optics-nuclei","tag-physics-class-12-notes-light-wave","tag-semiconductor","tag-thyristor"],"_links":{"self":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/posts\/5156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/users\/64"}],"replies":[{"embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/comments?post=5156"}],"version-history":[{"count":0,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/posts\/5156\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/media?parent=5156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/categories?post=5156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/tags?post=5156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}