{"id":4432,"date":"2016-05-16T09:49:00","date_gmt":"2016-05-16T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-atoms\/"},"modified":"2019-02-18T16:10:48","modified_gmt":"2019-02-18T10:40:48","slug":"ncert-solutions-class-12-physics-atoms","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-atoms\/","title":{"rendered":"NCERT Solutions class 12 physics Atoms"},"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\/ncert-solutions-class-12-physics-atoms\/#NCERT_Class_12_Physics_Chapter-wise_Solutions\" >NCERT Class 12 Physics Chapter-wise Solutions<\/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\/ncert-solutions-class-12-physics-atoms\/#CHAPTER_12_ATOMS\" >CHAPTER 12 ATOMS<\/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\/ncert-solutions-class-12-physics-atoms\/#NCERT_Solutions_class_12_physics_Atoms\" >NCERT Solutions class 12 physics Atoms<\/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\/ncert-solutions-class-12-physics-atoms\/#NCERT_Solutions_for_Class_12_Physics\" >NCERT Solutions for Class 12 Physics<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>NCERT Solutions class 12 physics Atoms Class 12 Physics<\/strong>\u00a0solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT textbooks. Class 12 Physics chapter wise NCERT solution for Physics part 1 and Physics part 2 for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>Download\u00a0<a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/ncert-solutions\/5\/\">NCERT Solutions for Physics\u00a0<\/a>as PDF.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/Class%2012%20physics%20book%2012.jpg\" alt=\"NCERT Solutions class 12 physics Atoms\" width=\"115\" height=\"141\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_12_Physics_Chapter-wise_Solutions\"><\/span><strong>NCERT Class 12 Physics Chapter-wise Solutions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1 \u2013 Electric Charges and Fields<\/li>\n<li>2 \u2013 Electrostatic Potential and Capacitance<\/li>\n<li>3 \u2013 Current Electricity<\/li>\n<li>4 \u2013 Moving Charges and Magnetism<\/li>\n<li>5 \u2013 Magnetism and Matter<\/li>\n<li>6 \u2013 Electromagnetic Induction<\/li>\n<li>7 \u2013 Alternating Current<\/li>\n<li>8 \u2013 Electromagnetic Waves<\/li>\n<li>9 \u2013 Ray Optics and Optical Instruments<\/li>\n<li>10 \u2013 Wave Optics<\/li>\n<li>11 \u2013 Dual Nature of Radiation and Matter<\/li>\n<li>12 \u2013 Atoms<\/li>\n<li>13 \u2013 Nuclei<\/li>\n<li>14 \u2013 Semiconductor Electronic: Material, Devices and Simple Circuits<\/li>\n<li>15 \u2013 Communication Systems<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CHAPTER_12_ATOMS\"><\/span>CHAPTER 12 ATOMS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>12.1 Introduction<\/li>\n<li>12.2 Alpha-particle Scattering and Rutherford\u2019s Nuclear Model of Atom<\/li>\n<li>12.3 Atomic Spectra<\/li>\n<li>12.4 Bohr Model of the Hydrogen Atom<\/li>\n<li>12.5 The Line Spectra of the Hydrogen Atom<\/li>\n<li>12.6 DE Broglie\u2019s Explanation of Bohr\u2019s Second Postulate of Quantisation<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_class_12_physics_Atoms\"><\/span>NCERT Solutions class 12 physics Atoms<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">1: \u00a0Choose the correct alternative from the clues given at the end of the each statement:<\/p>\n<p style=\"text-align: justify;\">(a) The size of the atom in Thomson&#8217;s model is &#8230;&#8230;&#8230;. the atomic size in Rutherford&#8217;s model. (much greater than\/no different from\/much less than.)<\/p>\n<p style=\"text-align: justify;\">(b) In the ground state of &#8230;&#8230;&#8230;. electrons are in stable equilibrium, while in &#8230;&#8230;&#8230;. electrons always experience a net force.<\/p>\n<p style=\"text-align: justify;\">(Thomson&#8217;s model\/ Rutherford&#8217;s model.)<\/p>\n<p style=\"text-align: justify;\">(c) A <em>classical<\/em> atom based on &#8230;&#8230;&#8230;. is doomed to collapse.<\/p>\n<p style=\"text-align: justify;\">(Thomson&#8217;s model\/ Rutherford&#8217;s model.)<\/p>\n<p style=\"text-align: justify;\">(d) An atom has a nearly continuous mass distribution in a &#8230;&#8230;&#8230;. but has a highly non-uniform mass distribution in &#8230;&#8230;&#8230;.<\/p>\n<p style=\"text-align: justify;\">(Thomson&#8217;s model\/ Rutherford&#8217;s model.)<\/p>\n<p style=\"text-align: justify;\">(e) The positively charged part of the atom possesses most of the mass in &#8230;&#8230;&#8230;. (Rutherford&#8217;s model\/both the models.)<\/p>\n<p style=\"text-align: justify;\">2: Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?<\/p>\n<p style=\"text-align: justify;\">3:\u00a0 What is the shortest wavelength present in the Paschen series of spectral lines?<\/p>\n<p style=\"text-align: justify;\">4:\u00a0 A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?<\/p>\n<p>5:\u00a0The ground state energy of hydrogen atom is -13.6 eV. What are the kinetic and potential energies of the electron in this state?<\/p>\n<p style=\"text-align: justify;\">6:\u00a0 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the <em>n<\/em> = 4 level. Determine the wavelength and frequency of the photon.<\/p>\n<p style=\"text-align: justify;\">7:\u00a0(a) Using the Bohr&#8217;s model calculate the speed of the electron in a hydrogen atom in the <em>n<\/em> = 1, 2, and 3 levels. (b) Calculate the orbital period in each of these levels.<\/p>\n<p style=\"text-align: justify;\">8:\u00a0The radius of the innermost electron orbit of a hydrogen atom is<img decoding=\"async\" style=\"height: 21px; width: 92px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image078.png\" \/>. What are the radii of the <em>n<\/em> = 2 and <em>n<\/em> =3 orbits?<\/p>\n<p style=\"text-align: justify;\">9:\u00a0A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?<\/p>\n<p style=\"text-align: justify;\">10:\u00a0In accordance with the Bohr&#8217;s model, find the quantum number that characterises the earth&#8217;s revolution around the sun in an orbit of radius <img decoding=\"async\" style=\"height: 21px; width: 79px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image098.png\" \/>\u00a0with orbital speed <img decoding=\"async\" style=\"height: 21px; width: 84px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image099.png\" \/> (Mass of earth = <img decoding=\"async\" style=\"height: 24px; width: 92px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image100.png\" \/><\/p>\n<p style=\"text-align: justify;\">11:\u00a0 Answer the following questions, which help you understand the difference between Thomson&#8217;s model and Rutherford&#8217;s model better.<\/p>\n<p style=\"text-align: justify;\">(a) Is the average angle of deflection of <em>\u03b1\u00ad<\/em>-particles by a thin gold foil predicted by Thomson&#8217;s model much less, about the same, or much greater than that predicted by Rutherford&#8217;s model?<\/p>\n<p style=\"text-align: justify;\">(b) Is the probability of backward scattering (i.e., scattering of <em>\u03b1<\/em>-particles at angles greater than 90\u00b0) predicted by Thomson&#8217;s model much less, about the same, or much greater than that predicted by Rutherford&#8217;s model?<\/p>\n<p style=\"text-align: justify;\">(c) Keeping other factors fixed, it is found experimentally that for small thickness <em>t<\/em>, the number of <em>\u03b1<\/em>-particles scattered at moderate angles is proportional to <em>t<\/em>. What clue does this linear dependence on <em>t<\/em> provide?<\/p>\n<p style=\"text-align: justify;\">(d) In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of <em>\u03b1<\/em>-particles by a thin foil?<\/p>\n<p style=\"text-align: justify;\">12:\u00a0 The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10<img decoding=\"async\" style=\"height: 20px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image111.png\" \/>. An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.<\/p>\n<p style=\"text-align: justify;\">13:\u00a0 Obtain an expression for the frequency of radiation emitted when a hydrogen atom de-excites from level <em>n<\/em> to level (<em>n<\/em>-1). For large <em>n<\/em>, show that this frequency equals the classical frequency of revolution of the electron in the orbit.<\/p>\n<p style=\"text-align: justify;\">14:\u00a0Classically, an electron can be in any orbit around the nucleus of an atom. Then what determines the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? The question had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as follows with the basic constants of nature and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom <img decoding=\"async\" style=\"height: 30px; width: 89px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image144.png\" \/><\/p>\n<p style=\"text-align: justify;\">(a) Construct a quantity with the dimensions of length from the fundamental constants <em>e<\/em>, <em>me<\/em>, and <em>c<\/em>. Determine its numerical value.<\/p>\n<p style=\"text-align: justify;\">(b) You will find that the length obtained in (a) is many orders of magnitude smaller than the atomic dimensions. Further, it involves <em>c<\/em>. But energies of atoms are mostly in non-relativistic domain where <em>c<\/em> is not expected to play any role. This is what may have suggested Bohr to discard <em>c<\/em> and look for &#8216;something else&#8217; to get the right atomic size. Now, the Planck&#8217;s constant <em>h<\/em> had already made its appearance elsewhere. Bohr&#8217;s great insight lay in recognising that <em>h<\/em>, <em>me<\/em>, and <em>e<\/em> will yield the right atomic size. Construct a quantity with the dimension of length from <em>h<\/em>, <em>me<\/em>, and <em>e<\/em> and confirm that its numerical value has indeed the correct order of magnitude.<\/p>\n<p style=\"text-align: justify;\">15:\u00a0 The total energy of an electron in the first excited state of the hydrogen atom is about -3.4 eV.<\/p>\n<p style=\"text-align: justify;\">(a) What is the kinetic energy of the electron in this state?<\/p>\n<p style=\"text-align: justify;\">(b) What is the potential energy of the electron in this state?<\/p>\n<p style=\"text-align: justify;\">(c) Which of the answers above would change if the choice of the zero of potential energy is changed?<\/p>\n<p style=\"text-align: justify;\">16:\u00a0 If Bohr&#8217;s quantisation postulate (angular momentum = <em>nh\/<\/em>2\u03c0) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why then do we never speak of quantisation of orbits of planets around the sun?<\/p>\n<p style=\"text-align: justify;\">17:\u00a0 Obtain the first Bohr&#8217;s radius and the ground state energy of a <em>muonic<\/em> <em>hydrogen atom<\/em> [i.e., an atom in which a negatively charged muon <img decoding=\"async\" style=\"height: 30px; width: 34px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch12\/image160.png\" \/>\u00a0of mass about 207me orbits around a proton].<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_12_Physics\"><\/span><strong>NCERT Solutions for Class 12 Physics<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 12 Physics PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 12 physics includes text book solutions from both part 1 and part 2. NCERT Solutions for CBSE Class 12 Physics have total 20 chapters. 12 Physics NCERT Solutions in PDF for free Download on our website. Ncert physics class 12 solutions PDF and physics ncert class 12 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide<\/p>\n<p>To download\u00a0NCERT Solutions 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","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions class 12 physics Atoms Class 12 Physics\u00a0solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT textbooks. Class 12 Physics chapter wise NCERT &#8230; <a title=\"NCERT Solutions class 12 physics Atoms\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-atoms\/\" aria-label=\"More on NCERT Solutions class 12 physics Atoms\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1433],"tags":[283,1342,216,319],"class_list":["post-4432","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-physics-cbse-class-12","tag-cbse-study-material","tag-class-12","tag-ncert-solutions","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions class 12 physics Atoms | myCBSEguide<\/title>\n<meta name=\"description\" content=\"NCERT Solutions class 12 physics Atoms in PDF format for free download. 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