{"id":311540,"date":"2022-11-06T15:47:34","date_gmt":"2022-11-06T10:17:34","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/franck-hertz-experiment\/"},"modified":"2025-05-16T15:50:51","modified_gmt":"2025-05-16T10:20:51","slug":"franck-hertz-experiment","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/physics\/franck-hertz-experiment\/","title":{"rendered":"Franck Hertz Experiment"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 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\">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\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><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><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/physics\/franck-hertz-experiment\/#Franck_hertz_experiment\" title=\"Franck hertz experiment\">Franck hertz experiment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/physics\/franck-hertz-experiment\/#Insight_to_the_Franck_Hertz_Experiment_Theory\" title=\"Insight to the Franck Hertz Experiment Theory\">Insight to the Franck Hertz Experiment Theory<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/physics\/franck-hertz-experiment\/#What_is_Frank_and_Hertz_experiment_Write_Information_about_the_Apparatus\" title=\"What is Frank and Hertz experiment: Write Information about the Apparatus\">What is Frank and Hertz experiment: Write Information about the Apparatus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/physics\/franck-hertz-experiment\/#What_happened_post_the_Franck_Hertz_Experiment\" title=\"What happened post the Franck Hertz Experiment\">What happened post the Franck Hertz Experiment<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Franck_hertz_experiment\"><\/span>Franck hertz experiment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"flex-1 overflow-hidden\">\n<div class=\"react-scroll-to-bottom--css-potab-79elbk h-full dark:bg-gray-800\">\n<div class=\"react-scroll-to-bottom--css-potab-1n7m0yu\">\n<div class=\"flex flex-col items-center text-sm h-full dark:bg-gray-800\">\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] md:flex-col lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<p>The Franck\u2013Hertz experiment is a classic physics experiment that was performed in 1914 by James Franck and Gustav Hertz. It was the first experiment to demonstrate quantization of energy in a solid, and it played a key role in the development of the theory of quantum mechanics.<\/p>\n<p>In the experiment, Franck and Hertz passed a beam of electrons through a tube filled with mercury vapor. They found that the current flowing through the tube would suddenly drop whenever the energy of the electrons was equal to the energy difference between certain energy levels of the mercury atoms. This indicated that the energy of the electrons could only take on certain discrete values, rather than being continuous as predicted by classical physics.<\/p>\n<p>The Franck\u2013Hertz experiment provided strong evidence for the existence of energy levels in atoms, and it helped to establish the foundations of quantum mechanics, which is the theory that describes the behavior of particles at the atomic and subatomic scales.<\/p>\n<p>The experiment has been modified and repeated many times over the years, and it is still a popular demonstration in undergraduate physics courses.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-4 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"w-full h-48 flex-shrink-0\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-323075\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/11\/Franck-Hertz-Experiment.png\" alt=\"Franck Hertz Experiment\" width=\"606\" height=\"428\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/11\/Franck-Hertz-Experiment.png?v=1672745583 606w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/11\/Franck-Hertz-Experiment-300x212.png?v=1672745583 300w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"absolute bottom-0 left-0 w-full border-t md:border-t-0 dark:border-white\/20 md:border-transparent md:dark:border-transparent md:bg-vert-light-gradient bg-white dark:bg-gray-800 md:!bg-transparent dark:md:bg-vert-dark-gradient\">\n<form class=\"stretch mx-2 flex flex-row gap-3 pt-2 last:mb-2 md:last:mb-6 lg:mx-auto lg:max-w-3xl lg:pt-6\">\n<div class=\"relative flex h-full flex-1 md:flex-col\">\n<div class=\"ml-1 mt-1.5 md:w-full md:m-auto md:flex md:mb-2 gap-2 justify-center\"><\/div>\n<\/div>\n<\/form>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Insight_to_the_Franck_Hertz_Experiment_Theory\"><\/span>Insight to the Franck Hertz Experiment Theory<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] md:flex-col lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<p>The Franck\u2013Hertz experiment generated several important insights about the nature of atoms and the behavior of particles at the atomic scale. Some of the key insights that were generated by the experiment include:<\/p>\n<ol>\n<li>Energy levels in atoms: The Franck\u2013Hertz experiment provided strong evidence for the existence of energy levels in atoms, in which the electrons are confined to specific energy levels rather than being able to occupy any energy level.<\/li>\n<li>Quantization of energy: The experiment demonstrated that the energy of electrons in atoms can only take on certain discrete values, rather than being continuous as predicted by classical physics. This led to the concept of quantization, in which energy is thought to be absorbed or emitted in discrete &#8220;packets&#8221; known as quanta.<\/li>\n<li>Atomic structure: The Franck\u2013Hertz experiment helped to confirm the model of the atom proposed by Niels Bohr, which stated that the electrons in an atom occupy specific energy levels and can only transition between these levels by absorbing or emitting energy.<\/li>\n<li>The foundations of quantum mechanics: The experimental results of the Franck\u2013Hertz experiment were difficult to explain using classical physics, and they played a key role in the development of the theory of quantum mechanics, which is the theory that describes the behavior of particles at the atomic and subatomic scales.<\/li>\n<li>The nature of matter: The Franck\u2013Hertz experiment helped to confirm that matter is composed of discrete particles, rather than being a continuous substance as was previously believed. It also helped to establish the wave-particle duality of matter, which states that particles can exhibit both wave-like and particle-like properties depending on the context in which they are observed.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-4 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Frank_and_Hertz_experiment_Write_Information_about_the_Apparatus\"><\/span>What is Frank and Hertz experiment: Write Information about the Apparatus<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"flex-1 overflow-hidden\">\n<div class=\"react-scroll-to-bottom--css-potab-79elbk h-full dark:bg-gray-800\">\n<div class=\"react-scroll-to-bottom--css-potab-1n7m0yu\">\n<div class=\"flex flex-col items-center text-sm h-full dark:bg-gray-800\">\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] md:flex-col lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<p>The Franck\u2013Hertz experiment was performed using a simple apparatus consisting of a tube filled with mercury vapor and a source of electrons. The apparatus was set up as follows:<\/p>\n<ol>\n<li>A high-voltage power supply was used to generate a beam of electrons.<\/li>\n<li>The beam of electrons was passed through a tube filled with mercury vapor.<\/li>\n<li>The tube was contained within a vacuum chamber to prevent air from entering the tube and interfering with the experiment.<\/li>\n<li>The tube was surrounded by a coil of wire, which was used to measure the current flowing through the tube.<\/li>\n<li>The high-voltage power supply was used to adjust the energy of the electrons, and the current flowing through the tube was measured as the energy of the electrons was varied.<\/li>\n<li>The results of the experiment were recorded using a graph, which plotted the current flowing through the tube as a function of the energy of the electrons.<\/li>\n<\/ol>\n<p>Overall, the apparatus used in the Franck\u2013Hertz experiment was relatively simple and easy to set up, and it allowed Franck and Hertz to clearly demonstrate the quantization of energy in a solid.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-4 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"w-full h-48 flex-shrink-0\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_happened_post_the_Franck_Hertz_Experiment\"><\/span>What happened post the Franck Hertz Experiment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group dark:bg-gray-800\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"relative flex w-[calc(100%-50px)] md:flex-col lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"w-full border-b border-black\/10 dark:border-gray-900\/50 text-gray-800 dark:text-gray-100 group bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 m-auto md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0\">\n<div class=\"w-[30px] flex flex-col relative items-end\">\n<div class=\"relative h-[30px] w-[30px] p-1 rounded-sm text-white flex items-center justify-center\"><\/div>\n<\/div>\n<div class=\"relative flex w-[calc(100%-50px)] md:flex-col lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<p>After the Franck\u2013Hertz experiment was published in 1914, it had a significant impact on the field of physics and helped to establish the foundations of the theory of quantum mechanics. The experimental results were difficult to explain using classical physics, and they played a key role in the development of the theory of quantum mechanics, which is the theory that describes the behavior of particles at the atomic and subatomic scales.<\/p>\n<p>The experiment provided strong evidence for the existence of energy levels in atoms, and it helped to confirm the model of the atom proposed by Niels Bohr, which stated that the electrons in an atom occupy specific energy levels and can only transition between these levels by absorbing or emitting energy. The experimental results also demonstrated the quantization of energy, in which energy is thought to be absorbed or emitted in discrete &#8220;packets&#8221; known as quanta.<\/p>\n<p>The Franck\u2013Hertz experiment had a major impact on the development of modern physics, and it is still a classic demonstration in undergraduate physics courses. Its insights continue to be important in our understanding of the nature of matter and the behavior of particles at the atomic scale.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-4 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Franck hertz experiment The Franck\u2013Hertz experiment is a classic physics experiment that was performed in 1914 by James Franck and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"franck hertz experiment","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"franck hertz experiment","custom_permalink":"physics\/franck-hertz-experiment\/"},"categories":[4],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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