{"id":63483,"date":"2026-05-17T04:46:51","date_gmt":"2026-05-16T19:46:51","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=63483"},"modified":"2026-05-17T04:46:51","modified_gmt":"2026-05-16T19:46:51","slug":"light-made-the-electricity-vanish-experience-einsteins-greatest-discovery-with-a-gold-leaf-electroscope","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=63483&lang=en","title":{"rendered":"Light Made the Electricity Vanish!? Experience Einstein&#8217;s Greatest Discovery with a Gold-Leaf Electroscope"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>I\u2019m Ken Kuwako, the Science Trainer. Every day is an experiment.<\/strong><\/span><\/p>\n<p>\u201cJust shine light on it, and the electricity disappears.\u201d<\/p>\n<p>It sounds like magic, but this strange phenomenon really happens in the lab. Even more fascinating, it\u2019s directly connected to the discovery that earned none other than Albert Einstein a Nobel Prize. Today, let\u2019s explore this mysterious experiment using a gold-leaf electroscope.<\/p>\n<h3>What Is a Gold-Leaf Electroscope?<\/h3>\n<p> A gold-leaf electroscope is a device used to detect static electricity (electric charge). Inside are two thin <b>metal leaves<\/b> hanging side by side. When electric charge builds up, the leaves repel each other and spread apart.<\/p>\n<p>In this experiment, we begin with the leaves already open. That means the electroscope is storing electric charge.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"d06buQlTVo\"><p><a href=\"https:\/\/phys-edu.net\/wp\/?p=34711\">\u7b94\u691c\u96fb\u5668\u3067\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u96fb\u8377\u306e\u52d5\u304d\u3092\u30a2\u30cb\u30e1\u3067\u518d\u73fe\uff01\uff08\u9759\u96fb\u6c17\u306e\u3075\u3057\u304e\u3092\u4f53\u611f\u3059\u308b\u300c\u7b94\u691c\u96fb\u5668\u300d\uff09<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;\u7b94\u691c\u96fb\u5668\u3067\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u96fb\u8377\u306e\u52d5\u304d\u3092\u30a2\u30cb\u30e1\u3067\u518d\u73fe\uff01\uff08\u9759\u96fb\u6c17\u306e\u3075\u3057\u304e\u3092\u4f53\u611f\u3059\u308b\u300c\u7b94\u691c\u96fb\u5668\u300d\uff09&#8221; &#8212; \u79d1\u5b66\u306e\u30cd\u30bf\u5e33\" src=\"https:\/\/phys-edu.net\/wp\/?p=34711&#038;embed=true#?secret=vkP4jEVmvm#?secret=d06buQlTVo\" data-secret=\"d06buQlTVo\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<h3>What Happens When Ultraviolet Light Hits It?<\/h3>\n<p> Next, we shine <b>ultraviolet light<\/b> onto the metal plate at the top of the charged electroscope.<\/p>\n<p>And then\u2014something incredible happens.<\/p>\n<p>The leaves slowly begin to close!<\/p>\n<p>Take a look at the video below to see it in action.<\/p>\n<p><iframe loading=\"lazy\" title=\"WOW\uff01\u7b94\u691c\u96fb\u5668\u306b\u7d2b\u5916\u7dda\u3092\u3042\u3066\u3066\u307f\u305f\u3089\u2026\uff01\u3010\u5149\u96fb\u52b9\u679c\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/e3Esp_qsehw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>It almost looks as if the light itself is sucking the electricity away. So what\u2019s really happening?<\/p>\n<h3>The Secret Behind the \u201cPhotoelectric Effect\u201d<\/h3>\n<p> This phenomenon is called the <b>photoelectric effect<\/b>. When light\u2014especially short-wavelength light like ultraviolet rays\u2014hits a metal surface, <b>electrons can be ejected from the metal<\/b>.<\/p>\n<p>In this experiment, the electroscope had accumulated negative charge, meaning extra electrons were stored on it. When ultraviolet light struck the metal plate, electrons began flying off the surface one after another. As the stored charge decreased, the leaves gradually closed.<\/p>\n<p>In other words, the light was literally knocking electrons loose from the metal.<\/p>\n<h3>The Surprising Link to Einstein\u2019s Nobel Prize<\/h3>\n<p> The photoelectric effect turned out to be one of the biggest scientific mysteries of the late 19th century. At the time, scientists couldn\u2019t fully explain it using the idea that light behaved only as a wave.<\/p>\n<p>Then came <b>Albert Einstein<\/b>.<\/p>\n<p>In 1905, Einstein proposed a revolutionary idea: light is made up of tiny packets of energy called photons. This bold theory perfectly explained the photoelectric effect.<\/p>\n<p>That achievement is exactly why Einstein received the <b>Nobel Prize in Physics in 1921<\/b>.<\/p>\n<p>Surprisingly, it wasn\u2019t relativity that won him the Nobel Prize\u2014it was his explanation of light itself.<\/p>\n<h3>The Photoelectric Effect Powers Modern Technology<\/h3>\n<p> The photoelectric effect isn\u2019t just a topic from old physics textbooks. It forms the foundation of many modern technologies we use every day.<\/p>\n<p>For example, <b>solar panels<\/b> generate electricity by using light energy to move electrons\u2014an application of the photoelectric effect.<\/p>\n<p>The <b>image sensors<\/b> inside smartphone and digital cameras also rely on this principle, converting light into electrical signals.<\/p>\n<p>Hidden inside that simple experiment\u2014watching thin metal leaves slowly close\u2014is one of the key pieces of physics supporting modern civilization.<\/p>\n<p>By simply shining ultraviolet light onto a gold-leaf electroscope, you can witness a glimpse of Einstein\u2019s groundbreaking realization that <b>\u201clight behaves like particles.\u201d<\/b><\/p>\n<p>Watch the video carefully and observe the exact moment the leaves begin to close. You\u2019ll be seeing one of the greatest discoveries in physics unfold right before your eyes.<\/p>\n<h3>Contact &#038; Requests<\/h3>\n<p> Science should feel exciting and accessible! Here you\u2019ll find fun science experiments you can try at home, along with easy-to-understand explanations and helpful tips. Feel free to explore more!<\/p>\n<p>\u30fbThe contents of \u201cScience Notebook\u201d have been published as a book. Learn more <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a><br \/>\n\u30fbAbout the creator, Ken Kuwako: <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a><br \/>\n\u30fbFor inquiries, writing requests, lectures, science workshops, TV supervision, appearances, and more: <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a><br \/>\n<span class=\"s2\">\u30fbGet updates on new articles on <a href=\"https:\/\/x.com\/kuwako\">X<\/a>!<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.youtube.com\/user\/kkuwako\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35048\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/3d9640dad7bc5538e76f92da1966ee19.jpg\" alt=\"\" width=\"30\" height=\"21\" \/><\/a><a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Idea Channel<\/a> features exciting experiment videos!<\/p>\n<h3>\uff15\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p>\u30ad\u30fc\u30f3\u3068\u51b7\u3048\u308b\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\uff01\u6c17\u6e29\u304c\u4e0a\u304c\u3063\u3066\u304f\u308b\u3053\u306e\u6642\u671f\u30fb\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u3092\u4f7f\u3063\u305f\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\u306e\u5b9f\u9a13\u306f\u3044\u304b\u304c\uff1f<\/p>\r\n<p><img class=\"alignnone wp-image-39516 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg 1406w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-300x168.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-1024x572.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-768x429.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-320x180.jpg 320w\" alt=\"\" width=\"453\" height=\"253\" \/><\/p>\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=39513\">\u6db2\u4f53\u30bc\u30ed\uff01\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u304c\u6d88\u3048\u308b\u307e\u3067\u306e\uff13\u6642\u9593\u3092\u79d1\u5b66\u3059\u308b\uff08\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\uff09<\/a><\/p>\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u76e3\u4fee\u30fb\u30a4\u30d9\u30f3\u30c8\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n<li>4\u670830\u65e5\uff08\u6728\uff09\u300cTHE\u7a81\u7834\u30d5\u30a1\u30a4\u30eb\u300d\uff08\u65e5\u672c\u30c6\u30ec\u30d3\uff09\u306e<a href=\"https:\/\/phys-edu.net\/wp\/?p=62906\">\u79d1\u5b66\u76e3\u4fee\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f<\/a>\u3002<\/li>\r\n<li>5\u67088\u65e5\uff08\u91d1\uff09<a href=\"https:\/\/phys-edu.net\/wp\/?p=62629\">\u7406\u79d1\u6559\u80b2\u30cb\u30e5\u30fc\u30b9<\/a>\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li>6\u670814\u65e5\uff08\u65e5\uff09\u3000\u5343\u8449\u5927\u5b66\u30a4\u30f3\u30b9\u30bf\u30ec\u30fc\u30b7\u30e7\u30f3\u300c\u63a2\u7a76\u300d\u306b\u3066\u8b1b\u5e2b\u3092\u52d9\u3081\u307e\u3059<\/li>\r\n<li>6\u670826\u65e5\uff08\u91d1\uff09\u3000\u5343\u8449\u5927\u5b66\u306e\u516c\u958b\u7814\u7a76\u4f1a\uff08\u4e2d\u5b66\u7406\u79d1\u306b\u3064\u3044\u3066\u6388\u696d\u516c\u958b\u4e88\u5b9a\uff09<\/li>\r\n<li>7\u670818\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09<br \/><img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><br \/><\/strong><\/li>\r\n<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002<br \/><img class=\"alignnone wp-image-45718 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg\" sizes=\"(max-width: 184px) 100vw, 184px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg 756w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c-300x269.jpg 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href=\"http:\/\/phys-edu.net\/wp\/?page_id=37\">About<\/a>\u00a0\u2026\u300c\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u300d\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u3084\u3001\u904b\u55b6\u8005\u3067\u3042\u308b\u6851\u5b50\u7814\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30fb\u60f3\u3044\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a> \u2026\u5b9f\u9a13\u6559\u5ba4\u306e\u3054\u4f9d\u983c\u3001\u57f7\u7b46\u30fb\u8b1b\u6f14\u306e\u76f8\u8ac7\u3001\u79d1\u5b66\u76e3\u4fee\u7b49\u306f\u3053\u3061\u3089\u306e\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u304a\u5bc4\u305b\u304f\u3060\u3055\u3044\u3002<\/li>\r\n<\/ul>\r\n","protected":false},"excerpt":{"rendered":"<p>I\u2019m Ken Kuwako, the Science Trainer. Every day is an experiment. \u201cJust shine light on it, and the electricity  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":35829,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":""},"categories":[781],"tags":[],"class_list":["post-63483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/05\/b787ecad58b1def51bfc9db92d1be846.jpg","jetpack-related-posts":[{"id":51654,"url":"https:\/\/phys-edu.net\/wp\/?p=51654&lang=en","url_meta":{"origin":63483,"position":0},"title":"Exam Alert! 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