{"id":8965,"date":"2018-02-08T14:44:51","date_gmt":"2018-02-08T09:14:51","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=8965"},"modified":"2019-03-05T12:15:27","modified_gmt":"2019-03-05T06:45:27","slug":"electromagnetic-waves-class-12-notes-physics","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/electromagnetic-waves-class-12-notes-physics\/","title":{"rendered":"Electromagnetic Waves Class 12 Notes Physics"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/electromagnetic-waves-class-12-notes-physics\/#CBSE_Guide_Electromagnetic_Waves_class_12_Notes\" >CBSE Guide Electromagnetic Waves class 12 Notes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/electromagnetic-waves-class-12-notes-physics\/#Class_12_Physics_notes_Chapter_8_Electromagnetic_Waves\" >Class 12 Physics notes Chapter 8 Electromagnetic Waves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/electromagnetic-waves-class-12-notes-physics\/#CBSE_Class_12_Physics_Revision_Notes_Chapter_8_Electromagnetic_Waves\" >CBSE Class 12\u00a0Physics Revision Notes Chapter 8 Electromagnetic Waves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/electromagnetic-waves-class-12-notes-physics\/#CBSE_Class_12_Revision_Notes_and_Key_Points\" >CBSE Class 12 Revision Notes and Key Points<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>CBSE Class 12 Physics Chapter 8 Electromagnetic Waves notes<\/strong> in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Electromagnetic Waves class 12 Notes latest chapter wise notes for quick preparation of CBSE board exams and school-based annual examinations. Class 12 Physics notes on chapter 8 Electromagnetic Waves are also available for download in CBSE Guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Guide_Electromagnetic_Waves_class_12_Notes\"><\/span><strong>CBSE Guide Electromagnetic Waves class 12 Notes<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. It includes all the topics given in NCERT class 12 Physics textbook. Users can download CBSE guide quick revision notes from myCBSEguide mobile app and my CBSE guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Class_12_Physics_notes_Chapter_8_Electromagnetic_Waves\"><\/span><strong>Class 12 Physics notes Chapter 8 Electromagnetic Waves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download CBSE class 12th revision notes for chapter 8 Electromagnetic Waves in PDF format for free. Download revision notes for Electromagnetic Waves class 12 Notes and score high in exams. These are the Electromagnetic Waves class 12 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter 8 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days.<\/p>\n<p style=\"text-align: center;\"><strong><a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/cbse-revision-notes\/7\/\">Download Revision Notes as PDF<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Class_12_Physics_Revision_Notes_Chapter_8_Electromagnetic_Waves\"><\/span><strong>CBSE Class 12\u00a0Physics Revision Notes Chapter 8 Electromagnetic Waves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Displacement Current: <\/strong>It is due to time-varying electric field &#8211;\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{i}_{d}}={{\\varepsilon }_{0}}\\frac{d{{\\phi }_{E}}}{dt}\" \/><\/span><\/span><br \/>\nDisplacement current acts as a source of magnetic field in exactly the same way as conduction current.<\/li>\n<li><strong>Maxwell&#8217;s equations:<\/strong><\/li>\n<\/ul>\n<ol>\n<li>Gauss law of electrostatics-\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\oint\\limits_s {\\vec E.d\\vec s} = {q \\over {{\\varepsilon _o}}}\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"94\" height=\"47\" \/><\/span><\/span><\/li>\n<li>Gauss law of magnetism-\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\oint\\limits_s {\\vec B.d\\vec s} = 0\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"84\" height=\"47\" \/><\/span><\/span><\/li>\n<li>Faraday&#8217;s law of eletromagnetic induction-\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\oint\\limits_c {\\vec E.d\\vec l} = - {{d{\\phi _B}} \\over {dt}}\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"118\" height=\"47\" \/><\/span><\/span><\/li>\n<li>Modified form of Ampere&#8217;s circuital law-\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\oint\\limits_c {\\vec B.d\\vec l} = {\\mu _o}\\left[ {{I_c} + {\\varepsilon _o}{{d{\\phi _E}} \\over {dt}}} \\right]\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"191\" height=\"48\" \/><\/span><\/span><\/li>\n<\/ol>\n<ul>\n<li><strong>Electromagnetic Waves:\u00a0<\/strong>These waves propagates through spaceas coupled electric and magnetic fields, oscillating perpendicular to each other and to the direction of propagation of the wave.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/review\/4675_img_01.jpg\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"300\" height=\"145\" \/><\/li>\n<\/ul>\n<ol>\n<li>Electromagnetic waves are produced only by charges that are accelerating, since acceleration is absolute, and not a relative phenomenon.<\/li>\n<li>An electric charge oscillating harmonically with frequency <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\upsilon\" \/><\/span><\/span>, produces electromagnetic waves of the same frequency <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\upsilon\" \/><\/span><\/span>.<\/li>\n<li>An electric dipole is a basic source of electromagnetic waves.<\/li>\n<li>Electromagnetic waves with wavelength of the order of a few metres were first produced and detected in the laboratory by Hertz in 1887. He thus verified a basic prediction of Maxwell\u2019s equations.<\/li>\n<li>Electromagnetic waves are transverse in nature.<\/li>\n<li>They do not require any material medium for their propagation.<\/li>\n<\/ol>\n<ul>\n<li><strong>Oscillation of Electric and Magnetic Fields: <\/strong>These oscillate sinusoidally in space and time in an electromagnetic wave. The oscillating electric and magnetic fields, E and B are perpendicular to each other and to the direction of propagation of the electromagnetic wave.<\/li>\n<li>For a wave of frequency <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\upsilon\" \/><\/span><\/span>, wavelength <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\lambda\" \/><\/span><\/span>, propagating along <em>z<\/em>-direction<\/li>\n<\/ul>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?E = {E_X}(t) = {E_0}\\sin (kz - \\omega t)\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"210\" height=\"18\" \/><\/span><\/span>\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? = {E_0}\\sin \\left[ {2\\pi \\left( {\\frac{z}{\\lambda } - vt} \\right)} \\right] = {E_0}\\sin \\left[ {2\\pi \\left( {\\frac{z}{\\lambda } - \\frac{t}{T}} \\right)} \\right]\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"345\" height=\"41\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?B = {B_Y}(t) = {B_0}\\sin (kz - \\omega t)\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"210\" height=\"18\" \/><\/span><\/span>\u00a0\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? = {B_0}\\sin \\left[ {2\\pi \\left( {\\frac{z}{\\lambda } - vt} \\right)} \\right] = {B_0}\\sin \\left[ {2\\pi \\left( {\\frac{z}{\\lambda } - \\frac{t}{T}} \\right)} \\right]\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"346\" height=\"41\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{{E_o}} \\over {{B_o}}} = c\" \/><\/span><\/span><\/p>\n<ul>\n<li><strong>Relation between <\/strong><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{\\mu }_{0}}\" \/><\/span><\/span><strong>\u00a0and <\/strong><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{\\varepsilon }_{0}}\" \/><\/span><\/span>\u00a0: The speed <em>c <\/em>of electromagnetic wave in vacuum is related to <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{\\mu }_{0}}\" \/><\/span><\/span>\u00a0 and\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{\\varepsilon }_{0}}\" \/><\/span><\/span>\u00a0(the free space permeability and permittivity constants) as\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?C=1\/\\sqrt{{{\\mu }_{0}}{{\\varepsilon }_{0}}}\" \/><\/span><\/span><\/li>\n<li>The value of <em>c <\/em>equals the speed of light obtained from optical measurements. Light is an electromagnetic wave; c is, therefore, also the speed of light. Electromagnetic waves other than light also have the same velocity c in free space.<\/li>\n<li><strong>Speed of Light: <\/strong>The speed of light, or of electromagnetic waves in a material medium is<\/li>\n<\/ul>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?v=1\/\\sqrt{\\mu \\varepsilon }\" \/><\/span><\/span>\u00a0Where <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\mu\" \/><\/span><\/span>\u00a0is the permeability of the medium and <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\varepsilon\" \/><\/span><\/span>\u00a0its permittivity.<\/p>\n<ul>\n<li>Electromagnetic waves carry energy as they travel through space and this energy is shared equally by the electric and magnetic fields.<\/li>\n<li><strong>Energy Per Unit Volume: <\/strong>If in a region of space in which there exist electric and magnetic fields <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\overrightarrow{E}\\text{ and }\\overrightarrow{B}\" \/><\/span><\/span>, there exists Energy Density (Energy per unit volume) associated with these fields is,<br \/>\n<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?U=\\frac{{{\\varepsilon }_{0}}}{2}{{\\overrightarrow{E}}^{2}}+\\frac{1}{2{{\\mu }_{0}}}{{\\overrightarrow{B}}^{2}}\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"150\" height=\"37\" \/><\/span><\/span>\u00a0where we are assuming that the concerned space consists of vacuum only.<\/li>\n<li>Electromagnetic waves transport momentum as well. When these waves strike a surface, a pressure is exerted on the surface.<\/li>\n<li>If total energy transferred to a surface in time <em>t <\/em>is <em>U<\/em>, total momentum delivered to this surface is <em>p <\/em>= <em>U<\/em>\/<em>c<\/em>.<\/li>\n<li><strong>Electromagnetic Spectrum: <\/strong>The orderly distribution of the electromagnetic waves in accordance with their wavelength or frequency into distinct groups having widely differing properties is called electromagnetic spectrum.<\/li>\n<li>The classification has more to do with the way these waves are produced and detected.<\/li>\n<li><strong>Different Regions of Spectrum: <\/strong>Different regions are known by different names; <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\gamma\" \/><\/span><\/span>\u00a0-rays, X-rays, ultraviolet rays, visible rays, infrared rays, microwaves and radio waves in order of increasing wavelength from<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{ - 2}}\\mathop A\\limits^0\" \/><\/span><\/span>\u00a0or <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{ - 12}}m\" \/><\/span><\/span>\u00a0to <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^6}m\" \/><\/span><\/span><\/li>\n<\/ul>\n<p>(a) Radio Waves:<\/p>\n<ul>\n<li>\u00a0These are produced by accelerated motion of charges in wires.<\/li>\n<li>\u00a0These are used in radio and television communication systems.<\/li>\n<li>These are generally in the frequency range from 500 kHz to about 1000 MHz or wavelength range 600 m to 0.1 m.<\/li>\n<\/ul>\n<p>(b) Microwaves:<\/p>\n<ul>\n<li>These are short wavelength radio waves with frequency\u00a0range 10<sup>9<\/sup>\u00a0Hz to 10<sup>12<\/sup>\u00a0Hz or wavelength range 0.3 m to 10<sup>-3<\/sup>\u00a0m.<\/li>\n<li>Due to their short wavelengths, they are suitable for radar systems used in aircraft navigation.<\/li>\n<li>Microwave ovens use them for cooking.<\/li>\n<\/ul>\n<p>(c) Infrared Waves:<\/p>\n<ul>\n<li>Frequency range\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{11}}Hz\\ to\\ 5 \\times {10^{14}}\\ Hz\" \/><\/span><\/span>\u00a0or wavelength range\u00a0<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?5 \\times {10^{ - 3}}m\\ to\\ {10^{ - 6}}m\" \/><\/span><\/span><\/li>\n<li>These are produced by hot bodies and molecules.<\/li>\n<li>They lie in the low frequency or long wavelength end of the visible spectrum.<\/li>\n<\/ul>\n<p>(d) Visible Light:<\/p>\n<ul>\n<li>The spectrum frequency runs from about 4 x <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{14}}Hz\" \/><\/span><\/span>\u00a0to about 7 x <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{14}}Hz\" \/><\/span><\/span>\u00a0or wavelength range <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?8 \\times {10^{ - 7}}m\\ to\\ 4 \\times {10^{ - 7}}m\" \/><\/span><\/span>.<\/li>\n<li>Our eyes are sensitive to this range of wavelengths.<\/li>\n<\/ul>\n<p>(e) Ultraviolet light:<\/p>\n<ul>\n<li>It covers frequency range from <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{16}}Hz\\ to\\ {10^{17}}Hz\" \/><\/span><\/span>\u00a0or\u00a0wavelengths range\u00a0from <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?3.5 \\times {10^{ - 7}}m\\ to\\ 1.5 \\times {10^{ - 7}}m\" \/><\/span><\/span>.<\/li>\n<li>The sun is an important source of UV rays.<\/li>\n<\/ul>\n<p>(f) X-rays:<\/p>\n<ul>\n<li>It covers frequency range from <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{18}}Hz\\ to\\ {10^{20}}Hz\" \/><\/span><\/span>\u00a0or\u00a0wavelengths range\u00a0from <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?100\\mathop {\\rm A}\\limits^o\\ to\\ 0.1\\mathop {\\rm A}\\limits^o\" \/><\/span><\/span>.<\/li>\n<li>It is used in medical diagnosis.<\/li>\n<\/ul>\n<p>(g) Gamma Rays:<\/p>\n<ul>\n<li>These lie in the upper frequency range <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\left( {{{10}^{18}}Hz\\ to\\ {{10}^{22}}Hz} \\right)\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"145\" height=\"21\" \/><\/span><\/span>\u00a0of the spectrum, and have wavelengths in the range <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{ - 14}}m\" \/><\/span><\/span>\u00a0to <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{10^{ - 10}}m\" \/><\/span><\/span>.<\/li>\n<li>It is used in\u00a0manufacture of polyethylene from ethylene.<\/li>\n<\/ul>\n<p><strong>Various layers of earth&#8217;s atmosphere:<\/strong><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/review\/4675_img_02.jpg\" alt=\"Electromagnetic Waves Class 12 Notes Physics\" width=\"300\" height=\"294\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Class_12_Revision_Notes_and_Key_Points\"><\/span><strong>CBSE Class 12 Revision Notes and Key Points<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Electromagnetic Waves class 12 Notes. CBSE quick revision note for class-12 Physics, Chemistry, Math\u2019s, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.<\/p>\n<ul>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/cbse-revision-notes\/7\/\">Physics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-chemistry\/1267\/cbse-revision-notes\/7\/\">Chemistry<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-mathematics\/1284\/cbse-revision-notes\/7\/\">Mathematics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-biology\/1298\/cbse-revision-notes\/7\/\">Biology<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-accountancy\/1315\/cbse-revision-notes\/7\/\">Accountancy<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-economics\/1327\/cbse-revision-notes\/7\/\">Economics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-business-studies\/1727\/cbse-revision-notes\/7\/\">Business Studies<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-computer-science\/1851\/cbse-revision-notes\/7\/\">Computer Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-informatics-practices\/1873\/cbse-revision-notes\/7\/\">Informatics Practices<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-english-core\/1855\/cbse-revision-notes\/7\/\">English Core<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-history\/1869\/cbse-revision-notes\/7\/\">History<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-physical-education\/1877\/cbse-revision-notes\/7\/\">Physical Education<\/a><\/li>\n<\/ul>\n<p>To download Electromagnetic Waves class 12 Notes, sample paper for class 12 Physics, Chemistry, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home Science; do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n<ul>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/electric-charges-fields-class-12-notes-physics\/\">Electric Charges and Fields class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/electrostatic-potential-capacitance-class-12-notes-physics\/\">Electrostatic Potential and Capacitance class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/current-electricity-class-12-notes-physics\/\">Current Electricity class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/moving-charges-magnetism-class-12-notes-physics\/\">Moving Charges and Magnetism class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/magnetism-matter-class-12-notes-physics\/\">Magnetism and Matter class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/electromagnetic-induction-class-12-notes-physics\/\">Electromagnetic Induction class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/alternating-current-class-12-notes-physics\/\">Alternating Current class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/ray-optics-and-optical-class-12-note-physics\/\">Ray Optics and Optical class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/wave-optics-class-12-notes-physics\/\">Wave Optics class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/dual-nature-radiation-matter-class-12-notes-physics\/\">Dual Nature of Radiation and Matter class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/atoms-class-12-notes-physics\/\">Atoms class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/nuclei-class-12-notes-physics\/\">Nuclei class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/electronic-devices-class-12-notes-physics\/\">Electronic Devices class 12 Notes Physics<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/communication-systems-class-12-notes-physics\/\">Communication Systems class 12 Notes Physics<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CBSE Class 12 Physics Chapter 8 Electromagnetic Waves notes in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Electromagnetic Waves class 12 Notes latest chapter wise notes for quick preparation of CBSE board exams and school-based annual examinations. Class 12 Physics notes on chapter 8 &#8230; <a title=\"Electromagnetic Waves Class 12 Notes Physics\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/electromagnetic-waves-class-12-notes-physics\/\" aria-label=\"More on Electromagnetic Waves Class 12 Notes Physics\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":8891,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,456],"tags":[457,150,478,458,426,240],"class_list":["post-8965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cbse-class-12","category-revision-notes","tag-cbse-notes","tag-cbse-notes-and-key-points","tag-electromagnetic-waves","tag-physics-notes","tag-quick-revision","tag-quick-revision-notes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Electromagnetic Waves Class 12 Notes Physics | myCBSEguide<\/title>\n<meta name=\"description\" content=\"Electromagnetic Waves class 12 Notes Physics chapter 8 in PDF format for free download. 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