{"id":206,"date":"2018-04-23T07:20:24","date_gmt":"2018-04-23T07:20:24","guid":{"rendered":"http:\/\/www.milq.info\/?page_id=206"},"modified":"2026-07-13T07:56:44","modified_gmt":"2026-07-13T05:56:44","slug":"m3_experimentelle_bestimmung_von_h","status":"publish","type":"page","link":"https:\/\/www.milq.info\/en\/m3_experimentelle_bestimmung_von_h\/","title":{"rendered":"Ways of experimentally determining h"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div><p>Here is a brief overview of the various ways of determining <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-136786816fe2d367638ebc058d467c0e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#104;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"10\" style=\"vertical-align: 0px;\"\/> experimentally, together with references to the literature:<\/p>\n<ul>\n<li><strong>Retarding-field method<\/strong><br \/>\nWith this method (described in the teaching text), difficulties can arise in detecting the photocurrent because of its low magnitude and the low intensity of the light falling on the cathode. Fritz Langensiepen discusses sources of error and improvements to the retarding-field method in his article: &#8220;Ein verbessertes Verfahren zur Bestimmung des Planckschen Wirkungsquantums mit in der Schule vorhandenen Mitteln&#8221;, in: Praxis der Naturwissenschaften-Physik 30 (1981)11, pp. 321-328.<\/li>\n<\/ul>\n<ul>\n<li><strong>Capacitor or charging method<\/strong><br \/>\nIn this measurement procedure the photocurrent of the vacuum photocell generates the counter-voltage itself by charging a capacitor. The terminals of the capacitor have to be connected to the anode and the cathode of the photocell respectively. The capacitor is charged up to the voltage that corresponds to the maximum energy of a photoelectron. By measuring or estimating the frequency of the light, Planck&#8217;s constant can be calculated using the equation <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-9f99e77e266616bd8f99aa676bcf6e2e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#101;&#32;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#85;&#32;&#61;&#32;&#104;&#32;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#102;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"129\" style=\"vertical-align: -4px;\"\/>.<br \/>\nFurther information can be found in the following articles:<br \/>\n&#8211; Fiebich, R., Hartung, G.: Demonstrationsversuch zur Bestimmung des Planckschen Wirkungsquantums mit einfachen schulischen Mitteln, in: Physik in der Schule 33(1995) 11, p. 407, and<br \/>\n&#8211; Wilke, H-J., Patzi, W., Tronicke, G.: Bestimmung des Planckschen Wirkungsquantums mittels Leuchtdioden, in: Physik in der Schule 35(1997) 10, pp. 344-347.<\/li>\n<\/ul>\n<ul>\n<li><strong>Absorption of light in potassium dichromate solution<\/strong><br \/>\nLight can be absorbed as it passes through a medium if it raises atoms or molecules into an excited state. Because of the quantization of the energy levels, only photons of a particular energy, or energy range (bands), can be absorbed. With a potassium dichromate solution the reaction energy can be determined experimentally. An equation for <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-136786816fe2d367638ebc058d467c0e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#104;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"10\" style=\"vertical-align: 0px;\"\/> can then be calculated from the wavelength of the absorption edge.<br \/>\nMore details can be found in the article &#8220;Das Plancksche Wirkungsquantum &#8211; einmal anders bestimmt&#8221; by Strahlke, W. and Siemon, H. in: Physik in der Schule 35(1997) 10, pp. 348-350.<\/li>\n<\/ul>\n<ul>\n<li><strong>Characteristic curves of light-emitting diodes<\/strong><br \/>\nIf light-emitting diodes of different colors are available, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-136786816fe2d367638ebc058d467c0e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#104;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"10\" style=\"vertical-align: 0px;\"\/> can also be determined from their characteristic curves. The forward voltage <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-b376f14e7656f9c1a9e88a3f56505676_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#123;&#92;&#109;&#97;&#116;&#104;&#114;&#109;&#123;&#68;&#125;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"23\" style=\"vertical-align: -3px;\"\/> of an LED depends on its color. If the forward voltage and the highest emitted frequency <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-37ab560be35387e1fca8b700e001acc3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#102;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"11\" style=\"vertical-align: -4px;\"\/> are determined for various LEDs, then the quotient <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-001d956edb716ac28dd2384508f55ebd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#85;&#95;&#123;&#92;&#109;&#97;&#116;&#104;&#114;&#109;&#123;&#68;&#125;&#125;&#125;&#123;&#102;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"25\" style=\"vertical-align: -17px;\"\/> is almost constant, namely <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.milq.info\/wp-content\/ql-cache\/quicklatex.com-19d5d32e64c858c7ff5eb823bea54d95_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#85;&#95;&#123;&#92;&#109;&#97;&#116;&#104;&#114;&#109;&#123;&#68;&#125;&#125;&#125;&#123;&#102;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#104;&#125;&#123;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"65\" style=\"vertical-align: -17px;\"\/>.<br \/>\nFurther information can be found in the following articles:<br \/>\n&#8211; Pitka, R.: Bestimmung von h\/e mit Leuchtdioden, in: Didaktik der Physik Vortr\u00e4ge 1986 (1987), pp. 160-164,<br \/>\n&#8211; H\u00fcbel, H.: Leuchtdioden: ann\u00e4hernd monochromatische Lichtquellen f\u00fcr physikalische Sch\u00fclerversuche zur Gitterbeugung und zum Planckschen Wirkungsquant, in: Praxis der Naturwissenschaften-Physik 3\/1982, pp. 77-84,<br \/>\n&#8211; Schwarze, H.: Mit Leuchtdioden zu E = hf, in: Praxis der Naturwissenschaften-Physik 1\/46 1997, pp. 34-36,<br \/>\n&#8211; Wilke, H-J., Patzi, W., Tronicke, G.: Bestimmung des Planckschen Wirkungsquantums mittels Leuchtdioden, in: Physik in der Schule 35(1997) 10, pp. 344-347.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.milq.info\/en\/mehr\/1-photonen\/\">Back<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Here is a brief overview of the various ways of determining experimentally, together with references to the literature: Retarding-field method With this method (described in the teaching text), difficulties can arise in detecting the photocurrent because of its low magnitude and the low intensity of the light falling on the cathode. Fritz Langensiepen discusses sources&hellip; <a href=\"https:\/\/www.milq.info\/en\/m3_experimentelle_bestimmung_von_h\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Ways of experimentally determining h<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-206","page","type-page","status-publish","hentry","without-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ways of experimentally determining h - milq<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.milq.info\/en\/m3_experimentelle_bestimmung_von_h\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ways of experimentally determining h - milq\" \/>\n<meta property=\"og:description\" content=\"Here is a brief overview of the various ways of determining experimentally, together with references to the literature: Retarding-field method With this method (described in the teaching text), difficulties can arise in detecting the photocurrent because of its low magnitude and the low intensity of the light falling on the cathode. 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