Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor

Detalhes bibliográficos
Autor(a) principal: dos Santos, Erick Santana
Data de Publicação: 2015
Outros Autores: Menezes Jr., Roberto dos Santos, da Silva Santana, Victor Mancir
Tipo de documento: Artigo
Idioma: por
Título da fonte: Caderno Brasileiro de Ensino de Física (Online)
Texto Completo: https://periodicos.ufsc.br/index.php/fisica/article/view/2175-7941.2015v32n3p824
Resumo: In this paper, we present an experimental method for the determination of Planck’s constant, based on the measurement of the discharge current of a capacitor on a LED, without the use of resistors. To develop this, we use a capacitor connected in parallel to a LED and observe the voltage on the capacitor during its discharge along with the current flowing through the ammeter connected in series to the LED. At the instant when the current becomes zero, the voltage applied on the LED corresponds to the cutoff voltage, by which we can determine the Planck’s constant. Moreover, we treat some important concepts about the quantum phenomena of the LED operation and present the results from this methodology, with some discussions. 
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spelling Experimental determination of the Planck’s constant by observation of the discharge current of a capacitorDeterminação experimental da constante de Planck pela observação da corrente de descarga de um capacitorIn this paper, we present an experimental method for the determination of Planck’s constant, based on the measurement of the discharge current of a capacitor on a LED, without the use of resistors. To develop this, we use a capacitor connected in parallel to a LED and observe the voltage on the capacitor during its discharge along with the current flowing through the ammeter connected in series to the LED. At the instant when the current becomes zero, the voltage applied on the LED corresponds to the cutoff voltage, by which we can determine the Planck’s constant. Moreover, we treat some important concepts about the quantum phenomena of the LED operation and present the results from this methodology, with some discussions. Neste artigo nós apresentamos um método experimental para a determinação da constante de Planck, baseado na medição da corrente de descarga de um capacitor sobre um LED, sem o uso de resistores. Para tanto, utilizamos um capacitor ligado em paralelo a um LED e observamos a tensão no capacitor durante sua descarga juntamente com a corrente que passa através do amperímetro, ligado em série ao LED. No instante em que a corrente torna-se zero, a tensão aplicada sobre o LED corresponde à tensão de corte, pela qual podemos determinar a constante de Planck. Além disso, nós discutimos alguns conceitos importantes a respeito dos aspectos quânticos do funcionamento do LED e apresentamos os resultados obtidos a partir desta metodologia, com algumas discussões.Imprensa Universitária - UFSC2015-06-24info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsc.br/index.php/fisica/article/view/2175-7941.2015v32n3p82410.5007/2175-7941.2015v32n3p824Caderno Brasileiro de Ensino de Física; v. 32 n. 3 (2015); 824-8362175-79411677-2334reponame:Caderno Brasileiro de Ensino de Física (Online)instname:Universidade Federal de Santa Catarina (UFSC)instacron:UFSCporhttps://periodicos.ufsc.br/index.php/fisica/article/view/2175-7941.2015v32n3p824/30638Copyright (c) 2015 Caderno Brasileiro de Ensino de Físicainfo:eu-repo/semantics/openAccessdos Santos, Erick SantanaMenezes Jr., Roberto dos Santosda Silva Santana, Victor Mancir2018-03-16T12:41:28Zoai:periodicos.ufsc.br:article/36352Revistahttp://www.periodicos.ufsc.br/index.php/fisicaPUBhttps://periodicos.ufsc.br/index.php/fisica/oaicbefisica@gmail.com||fscccef@fsc.ufsc.br|| cbefisica@gmail.com2175-79411677-2334opendoar:2018-03-16T12:41:28Caderno Brasileiro de Ensino de Física (Online) - Universidade Federal de Santa Catarina (UFSC)false
dc.title.none.fl_str_mv Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
Determinação experimental da constante de Planck pela observação da corrente de descarga de um capacitor
title Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
spellingShingle Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
dos Santos, Erick Santana
title_short Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
title_full Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
title_fullStr Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
title_full_unstemmed Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
title_sort Experimental determination of the Planck’s constant by observation of the discharge current of a capacitor
author dos Santos, Erick Santana
author_facet dos Santos, Erick Santana
Menezes Jr., Roberto dos Santos
da Silva Santana, Victor Mancir
author_role author
author2 Menezes Jr., Roberto dos Santos
da Silva Santana, Victor Mancir
author2_role author
author
dc.contributor.author.fl_str_mv dos Santos, Erick Santana
Menezes Jr., Roberto dos Santos
da Silva Santana, Victor Mancir
description In this paper, we present an experimental method for the determination of Planck’s constant, based on the measurement of the discharge current of a capacitor on a LED, without the use of resistors. To develop this, we use a capacitor connected in parallel to a LED and observe the voltage on the capacitor during its discharge along with the current flowing through the ammeter connected in series to the LED. At the instant when the current becomes zero, the voltage applied on the LED corresponds to the cutoff voltage, by which we can determine the Planck’s constant. Moreover, we treat some important concepts about the quantum phenomena of the LED operation and present the results from this methodology, with some discussions. 
publishDate 2015
dc.date.none.fl_str_mv 2015-06-24
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://periodicos.ufsc.br/index.php/fisica/article/view/2175-7941.2015v32n3p824
10.5007/2175-7941.2015v32n3p824
url https://periodicos.ufsc.br/index.php/fisica/article/view/2175-7941.2015v32n3p824
identifier_str_mv 10.5007/2175-7941.2015v32n3p824
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://periodicos.ufsc.br/index.php/fisica/article/view/2175-7941.2015v32n3p824/30638
dc.rights.driver.fl_str_mv Copyright (c) 2015 Caderno Brasileiro de Ensino de Física
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2015 Caderno Brasileiro de Ensino de Física
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Imprensa Universitária - UFSC
publisher.none.fl_str_mv Imprensa Universitária - UFSC
dc.source.none.fl_str_mv Caderno Brasileiro de Ensino de Física; v. 32 n. 3 (2015); 824-836
2175-7941
1677-2334
reponame:Caderno Brasileiro de Ensino de Física (Online)
instname:Universidade Federal de Santa Catarina (UFSC)
instacron:UFSC
instname_str Universidade Federal de Santa Catarina (UFSC)
instacron_str UFSC
institution UFSC
reponame_str Caderno Brasileiro de Ensino de Física (Online)
collection Caderno Brasileiro de Ensino de Física (Online)
repository.name.fl_str_mv Caderno Brasileiro de Ensino de Física (Online) - Universidade Federal de Santa Catarina (UFSC)
repository.mail.fl_str_mv cbefisica@gmail.com||fscccef@fsc.ufsc.br|| cbefisica@gmail.com
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