{"id":335,"date":"2020-09-15T12:21:27","date_gmt":"2020-09-15T07:21:27","guid":{"rendered":"https:\/\/talib.pk\/test-preparation\/?p=335"},"modified":"2020-09-15T12:21:27","modified_gmt":"2020-09-15T07:21:27","slug":"physics-chapter-20-atomic-spectra-mcqs-with-answers-2nd-year","status":"publish","type":"post","link":"https:\/\/talib.pk\/test-preparation\/physics-chapter-20-atomic-spectra-mcqs-with-answers-2nd-year\/","title":{"rendered":"Physics Chapter 20 Atomic Spectra MCQs with Answers 2nd Year"},"content":{"rendered":"<div class=\"28d95f43054b69d67289d6316e9506d8\" data-index=\"1\" style=\"float: none; margin:12px 0 12px 0; text-align:center;\">\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- talib-new -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3438155045791616\"\r\n     data-ad-slot=\"6774242552\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>The second last chapter is about Atomic Spectra and we will study Physics Chapter 20 Atomic Spectra MCQs with Answers 2nd Year. Spectrum is the set of frequencies absorbed or emitted by a substance. The Spectrum of Hydrogen is studied here and it has 5 series. In addition to Rutherford\u2019s atomic model, Bohr proposed an atomic model to remove the objections. His atomic model is a mixture of classical and modern physics. Here we will also study the energies and potentials of these spectra. Then the characteristics of X-rays are very important. There is some uncertainty within the atom-like an electron can\u2019t exist in the nucleus. In the end, there is an important topic of LASER. It has different characteristics and Properties included in this chapter. So, this is a brief intro about the 2nd Year Physics Chapter 20 Atomic Spectra.<\/p>\n<h2 style=\"text-align: center;\">Physics Chapter 20 Atomic Spectra MCQs with Answers<br \/>\n2nd Year<\/h2>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-336 aligncenter\" src=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2020\/09\/Physics-2nd-Year-MCQs-8.jpg\" alt=\"Physics Chapter 20 Atomic Spectra MCQs with Answers 2nd Year\" width=\"300\" height=\"300\" srcset=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2020\/09\/Physics-2nd-Year-MCQs-8.jpg 300w, https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2020\/09\/Physics-2nd-Year-MCQs-8-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n\n    <!-- Custom CSS for Quiz -->\n    <style type=\"text\/css\">\n\n    \/* Fixes *\/\n    #advq_quiz_304 ul.advq_question_list {\n        padding:10px 0;\n        margin:0;\n    }\n\n    #advq_quiz_304 {\n        font-family: ;\n        font-size: 1em;\n        line-height: 1.5em;\n        font-weight: 400;\n        font-style: ;\n    }\n\n    #advq_quiz_304 .advq_button,\n    #advq_quiz_304 .advq_validade_ck,\n    #advq_quiz_304 .advq_next_button,\n    #advq_quiz_304 .advq_start_quiz_button,\n    #advq_quiz_304 .advq-restart,\n    #advq_quiz_304 .advq-restart a {\n        color:#FFFFFF;\n        background-color:rgba(231,76,60,1);\n        font-family: ;\n    }\n\n    #advq_quiz_304 .advq_button,\n    #advq_quiz_304 .advq_next_button,\n    #advq_quiz_304 .advq_start_quiz_button {\n        font-size: 1em;\n        line-height: 1.5em;\n        font-weight: 400;\n        font-style: ;\n    }\n\n    #advq_quiz_304 .advq_button:hover,\n    #advq_quiz_304 .advq_validade_ck:hover,\n    #advq_quiz_304 .advq_next_button:hover,\n    #advq_quiz_304 .advq_start_quiz_button:hover,\n    #advq_quiz_304 .advq-restart:hover,\n    #advq_quiz_304 .advq-restart a:hover {\n        color:#FFFFFF;\n        background-color:rgba(231,76,60,1);\n    }\n\n    #advq_quiz_304 {\n            max-width:100%;\n        }\n        \n    \/* Questions *\/\n    #advq_quiz_304 .advq_question {\n        color: rgba(0,0,0,1);\n        font-family: ;\n        font-size: 1.5em;\n        line-height: 1.5em;\n        padding-top: 10px;\n        padding-right: 10px;\n        padding-bottom: 10px;\n        padding-left: 10px;\n        background-color: rgba(255,255,255,1);\n        font-weight: 700;\n        font-style: ;\n    }\n    \/* General rule for Answers *\/\n    #advq_quiz_304 .advq_question_container li {\n        font-family: ;\n        font-size: 1em;\n        line-height: 1.5em;\n        font-weight: 400;\n        font-style: ;\n        padding-top: 10px;\n        padding-right: 10px;\n        padding-bottom: 10px;\n        padding-left: 10px;\n    }\n\n    \/* Normal State *\/\n    #advq_quiz_304 .advq_question_container li.quiz_unselected_answer {\n        background-color: rgba(244,244,244,1);\n        color: rgba(0,0,0,1);\n    }\n    \/* Hover State *\/\n    #advq_quiz_304 .advq_question_container ul.advq_question_list:not(.quiz_question_done) li:hover {\n        background-color: rgba(255,249,185,1);\n        color: rgba(0,0,0,1);\n    }\n    \/* Selected Answer *\/\n    #advq_quiz_304 .advq_question_container  li.quiz_selected_answer {\n        background-color: rgba(207,227,255,1);\n        color: rgba(0,0,0,1);\n    }\n    \/* Correct Answer *\/\n    #advq_quiz_304 .advq_question_container li.quiz_selected_answer.quiz_correct_answer {\n        background-color: rgba(158,208,100,1);\n        color: rgba(0,0,0,1);\n    }\n    \/* Unselected Correct Answer *\/\n    #advq_quiz_304 .advq_question_container li.quiz_unselected_answer.quiz_unselected_correct_answer {\n        background-color: rgba(158,208,100,1);\n        color: rgba(0,0,0,1);\n    }\n    \/* Wrong Answer *\/\n    #advq_quiz_304 .advq_question_container li.quiz_selected_answer.quiz_incorrect_answer {\n        background-color: rgba(243,134,129,1);\n        color: rgba(0,0,0,1);\n    }\n\n    \/* Answer Information *\/\n    #advq_quiz_304 .advq_answer_commentary {\n        background-color: rgba(244,244,244,1);\n        color: rgba(0,0,0,1);\n    }\n\n    \/* Answers Container *\/\n    #advq_quiz_304 .advq_results_wrapper {\n        background-color: rgba(249,249,249,1);\n        color: rgba(0,0,0,1);\n        padding-top: 20px;\n        padding-right: 20px;\n        padding-bottom: 20px;\n        padding-left: 20px;\n        margin-top: 20px;\n        margin-right: 0;\n        margin-bottom: 0;\n        margin-left: 0;\n        border:1px solid #f5f5f5;\n    }\n    #advq_quiz_304 .advq_review_answers {\n        padding-top: 20px;\n        padding-right: 20px;\n        padding-bottom: 20px;\n        padding-left: 20px;\n    }\n    \n    <\/style><div style='opacity:0' class='advq_quiz_wrap advq_minimal advq_hasprogbar' data-quiz-id='304' id='advq_quiz_304' data-qtype='trivia' data-qlayout='minimal' data-unique-visitor='69e5bfe19875e' data-start-time='1776664545' data-options='{\"provide_result\":false,\"allow_change\":false,\"result_position\":\"inline\",\"one_page\":true,\"scroll_to_next\":false,\"progress_bar\":\"disabled\",\"back_button\":false,\"list_mode\":false,\"relation\":\"AND\"}'><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-11\" >An X-ray tube operating at 30kV, will emit X-ray of minimum wavelength____________.<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-11\"><li class=\"quiz_unselected_answer\"><input data-value='2.14 &Aring;' data-rule='0' id='question-11_0' name='question-11' type='radio' data-points='1'> <label for='question-11_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2.14 \u00c5<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='0.413 &Aring;' data-rule='1' id='question-11_1' name='question-11' type='radio' data-points='1'> <label for='question-11_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>0.413 \u00c5<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2840&Aring;' data-rule='0' id='question-11_2' name='question-11' type='radio' data-points='1'> <label for='question-11_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2840\u00c5<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='1.78 &Aring;' data-rule='0' id='question-11_3' name='question-11' type='radio' data-points='1'> <label for='question-11_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>1.78 \u00c5<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-10\" >In He-Ne laser, the lasing action is produced by:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-10\"><li class=\"quiz_unselected_answer\"><input data-value='Ne only' data-rule='1' id='question-10_0' name='question-10' type='radio' data-points='1'> <label for='question-10_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Ne only<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Electrons of Ne' data-rule='0' id='question-10_1' name='question-10' type='radio' data-points='1'> <label for='question-10_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Electrons of Ne<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='He-Ne both' data-rule='0' id='question-10_2' name='question-10' type='radio' data-points='1'> <label for='question-10_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>He-Ne both<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Electrons of He' data-rule='0' id='question-10_3' name='question-10' type='radio' data-points='1'> <label for='question-10_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Electrons of He<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-14\" >The angular momentum of electron in nth orbit is given by:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-14\"><li class=\"quiz_unselected_answer\"><input data-value='nh\/2 &pi;' data-rule='1' id='question-14_0' name='question-14' type='radio' data-points='1'> <label for='question-14_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>nh\/2 \u03c0<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='h\/2&pi;n' data-rule='0' id='question-14_1' name='question-14' type='radio' data-points='1'> <label for='question-14_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>h\/2\u03c0n<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='n^2h\/2 &pi;' data-rule='0' id='question-14_2' name='question-14' type='radio' data-points='1'> <label for='question-14_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>n^2h\/2 \u03c0<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='nh' data-rule='0' id='question-14_3' name='question-14' type='radio' data-points='1'> <label for='question-14_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>nh<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-15\" >Reverse process of photoelectric effect is:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-15\"><li class=\"quiz_unselected_answer\"><input data-value='X-rays productions' data-rule='1' id='question-15_0' name='question-15' type='radio' data-points='1'> <label for='question-15_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>X-rays productions<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Compton effect' data-rule='0' id='question-15_1' name='question-15' type='radio' data-points='1'> <label for='question-15_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Compton effect<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Annihilation of matter' data-rule='0' id='question-15_2' name='question-15' type='radio' data-points='1'> <label for='question-15_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Annihilation of matter<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Pair production ' data-rule='0' id='question-15_3' name='question-15' type='radio' data-points='1'> <label for='question-15_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Pair production <\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-9\" >UV radiation can be produced by:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-9\"><li class=\"quiz_unselected_answer\"><input data-value='Ionization of atoms' data-rule='0' id='question-9_0' name='question-9' type='radio' data-points='1'> <label for='question-9_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Ionization of atoms<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Heating the filament' data-rule='0' id='question-9_1' name='question-9' type='radio' data-points='1'> <label for='question-9_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Heating the filament<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='All' data-rule='0' id='question-9_2' name='question-9' type='radio' data-points='1'> <label for='question-9_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>All<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Electron excitation in the gas' data-rule='1' id='question-9_3' name='question-9' type='radio' data-points='1'> <label for='question-9_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Electron excitation in the gas<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-8\" >LASER action can\u2019t be achieved without: <\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-8\"><li class=\"quiz_unselected_answer\"><input data-value='All of them' data-rule='0' id='question-8_0' name='question-8' type='radio' data-points='1'> <label for='question-8_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>All of them<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Spontaneous emission' data-rule='0' id='question-8_1' name='question-8' type='radio' data-points='1'> <label for='question-8_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Spontaneous emission<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Population inversion' data-rule='1' id='question-8_2' name='question-8' type='radio' data-points='1'> <label for='question-8_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Population inversion<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Induced emission' data-rule='0' id='question-8_3' name='question-8' type='radio' data-points='1'> <label for='question-8_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Induced emission<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-2\" >Excited atoms return to their ground state in:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-2\"><li class=\"quiz_unselected_answer\"><input data-value='10^-9s' data-rule='0' id='question-2_0' name='question-2' type='radio' data-points='1'> <label for='question-2_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>10^-9s<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='10^-10s' data-rule='0' id='question-2_1' name='question-2' type='radio' data-points='1'> <label for='question-2_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>10^-10s<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='10^-8s' data-rule='1' id='question-2_2' name='question-2' type='radio' data-points='1'> <label for='question-2_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>10^-8s<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='10^-6s' data-rule='0' id='question-2_3' name='question-2' type='radio' data-points='1'> <label for='question-2_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>10^-6s<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-1\" >Photon of highest frequency will be absorbed when transition takes place from_______.<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-1\"><li class=\"quiz_unselected_answer\"><input data-value='3rd to 5th orbit' data-rule='0' id='question-1_0' name='question-1' type='radio' data-points='1'> <label for='question-1_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>3rd to 5th orbit<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2nd to 5th orbit' data-rule='0' id='question-1_1' name='question-1' type='radio' data-points='1'> <label for='question-1_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2nd to 5th orbit<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='1st to 5th Orbit' data-rule='1' id='question-1_2' name='question-1' type='radio' data-points='1'> <label for='question-1_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>1st to 5th Orbit<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='4th to 5th orbit' data-rule='0' id='question-1_3' name='question-1' type='radio' data-points='1'> <label for='question-1_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>4th to 5th orbit<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-3\" >In excited state the total energy is E, what is K.E with proper sign?<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-3\"><li class=\"quiz_unselected_answer\"><input data-value='-E\/2' data-rule='0' id='question-3_0' name='question-3' type='radio' data-points='1'> <label for='question-3_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>-E\/2<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2E' data-rule='0' id='question-3_1' name='question-3' type='radio' data-points='1'> <label for='question-3_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2E<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='-E' data-rule='1' id='question-3_2' name='question-3' type='radio' data-points='1'> <label for='question-3_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>-E<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2\/E' data-rule='0' id='question-3_3' name='question-3' type='radio' data-points='1'> <label for='question-3_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2\/E<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-5\" >Radiation with wavelength longer than red lights: <\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-5\"><li class=\"quiz_unselected_answer\"><input data-value='Infrared radiations' data-rule='1' id='question-5_0' name='question-5' type='radio' data-points='1'> <label for='question-5_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Infrared radiations<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='X-rays' data-rule='0' id='question-5_1' name='question-5' type='radio' data-points='1'> <label for='question-5_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>X-rays<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='UV rays ' data-rule='0' id='question-5_2' name='question-5' type='radio' data-points='1'> <label for='question-5_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>UV rays <\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Visible radiation' data-rule='0' id='question-5_3' name='question-5' type='radio' data-points='1'> <label for='question-5_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Visible radiation<\/label><\/li><\/ul><\/div><\/div><div class=\"advq_before_results\"><div class=\"advq_checkanswers \">\n\t\t<div class=\"advq_button\">Check Answers<\/div>\n        <div class=\"advq_warning\"><\/div>\n\t<\/div><\/div><div class=\"advq_results_wrapper\"><div style=\"display:none;\" class=\"advq_results_title\">Your Result:<\/div><div style=\"display:none;\" class=\"advq_no_results\"><div class=\"advq_no_results_title\">Sorry, no results found.<\/div>Please repeat the quiz and try different answer combinations.<\/div><div style=\"display:none;\" data-query=\"\" data-up-to=\"\" class=\"advq_feedback_box\" id=\"advq_feedback_1600150485\" data-title=\"\" data-unique-id=\"feedback_1600150485\" data-tag=\"\" data-redirect=\"\">\n\t\t\t\t\t\t<div class=\"advq_feedback_title\"><\/div><div class=\"advq_feedback_description\"><\/div><div class=\"advq-share-buttons\">\n\t  \t\t\t\t<div class=\"advq-fb-link\">\n\t  \t\t\t\t\t<a data-social-network=\"facebook\" href=\"https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Ftalib.pk%2Ftest-preparation%2Fwp-json%2Fwp%2Fv2%2Fposts%2F335%3Fqid%3D304qr%7Brid%7D\" target=\"_blank\" title=\"Share on Facebook\"><i class=\"fa fa-facebook-square\" aria-hidden=\"true\"><\/i> <span>Share your results<\/span><\/a><\/div>\n\t \t\t\t \t<div class=\"advq-twitter-link\">\n\t \t\t\t \t\t<a data-social-network=\"twitter\" href=\"https:\/\/twitter.com\/intent\/tweet?source=https%3A%2F%2Ftalib.pk%2Ftest-preparation%2Fwp-json%2Fwp%2Fv2%2Fposts%2F335%3Fqid%3D304qr%7Brid%7D&text={result}2nd Year Physics Chapter 20 Atomic Spectra MCQs with Answers: https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/335?qid=304qr{rid}\" target=\"_blank\" title=\"Tweet\"><i class=\"fa fa-twitter\" aria-hidden=\"true\"><\/i><span> Share your results<\/span><\/a><\/div>\n\t\t\t\t\t<div class=\"advq-linkedin-link\">\n\t  \t\t\t\t\t<a data-social-network=\"linkedin\" href=\"https:\/\/www.linkedin.com\/sharing\/share-offsite\/?url=https%3A%2F%2Ftalib.pk%2Ftest-preparation%2Fwp-json%2Fwp%2Fv2%2Fposts%2F335%3Fqid%3D304qr%7Brid%7D\" target=\"_blank\" title=\"Share on Linkedin\"><i class=\"fa fa-linkedin-square\" aria-hidden=\"true\"><\/i> <span>Share your results<\/span><\/a><\/div>\n\t\t\t\t<\/div><\/div>\n                <div class=\"advq-restart\">\n                    <a href=\"\/test-preparation\/wp-json\/wp\/v2\/posts\/335\" title=\"Retake Quiz\"><i class=\"fa fa-refresh\" aria-hidden=\"true\"><\/i> <span>Retake Quiz<\/span><\/a>\n                <\/div><\/div><!-- Closing div for results --><\/div><!-- Closing div for quiz -->\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>The second last chapter is about Atomic Spectra and we will study Physics Chapter 20 Atomic Spectra MCQs with Answers 2nd Year. Spectrum is the set of frequencies absorbed or emitted by a substance. The Spectrum of Hydrogen is studied here and it has 5 series. In addition to Rutherford\u2019s atomic model, Bohr proposed an &hellip;<\/p>\n","protected":false},"author":2,"featured_media":336,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/335"}],"collection":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/comments?post=335"}],"version-history":[{"count":0,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/335\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media\/336"}],"wp:attachment":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media?parent=335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/categories?post=335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/tags?post=335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}