A direct potential measurement in the photoelectric effect experiment

Bobst, Richard L.; Karlow, Edwin A.

doi:10.1119/1.14366

Cited by 9 publications

(13 citation statements)

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“…Such definition proves that the flow of electric current from the cathode has actually an electric potential that is balanced by the anode's potential when it is stopped. According to the traditional definitions of the photoelectric effect as a flow of emitted electrons from the cathode plate that haven't any specific potential, it is hard to explain how such electrons are stopped and the trials of many authors to explain such process were inconvenient [20]. So, the results of this experiment represents a proof of the truth of the postulated definition of electric current as electromagnetic waves and find a plausible explanation for defining the photoelectric effect as a Seebeck effect.…”

Section: The Photoelectric Effectmentioning

confidence: 73%

An Entropy Approach to a Practical Limit of the Efficiencies of Developed and Multijunction Solar Cells

Abdelhady¹

2014

JEMAA

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Following a previously introduced entropy approach and reviewing experimental measurements, we find a similarity option between photoelectric effects, photovoltaic effects and thermoelectric effects. The photovoltaic effect and the thermoelectric effect are proved in this study to be driven by a Seebeck effect which depends mainly on the thermal potential of the incident radiation and the interacting materials. Hence, we apply such exciting conclusion to derive an advanced efficiency limit of the developed and multijunction solar cells that exceed the previously derived limit by Shockley and Queisser.

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Section: The Photoelectric Effectmentioning

confidence: 73%

An Entropy Approach to a Practical Limit of the Efficiencies of Developed and Multijunction Solar Cells

Abdelhady¹

2014

JEMAA

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“…Nowadays, the measurement of Planck's constant is ordinarily performed by physics students in many educational laboratories, both in universities and in high schools. The most common techniques exploit the blackbody radiation (see [3][4][5][6][7]), the emission of light by LEDs when a forward bias is applied (see [8]) or the photoelectric effect (see [9][10][11][12][13]).…”

Section: Introductionmentioning

confidence: 99%

Measurement of the ratio h / e with a photomultiplier tube and a set of LEDs

et al. 2017

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We propose a laboratory experience aimed at undergraduate physics students to understand the main features of the photoelectric effect and to perform a measurement of the ratio h/e, where h is Planck’s constant and e is the electron charge. The experience is based on the method developed by Millikan for his measurements of the photoelectric effect in the years from 1912 to 1915. The experimental setup consists of a photomultiplier tube (PMT) equipped with a voltage divider properly modified to set variable retarding potentials between the photocathode and the first dynode, and a set of LEDs emitting at different wavelengths. The photocathode is illuminated with the various LEDs and, for each wavelength of the incident light, the output anode current is measured as a function of the retarding potential applied between the cathode and the first dynode. From each measurement, a value of the stopping potential for the anode current is derived. Finally, the stopping potentials are plotted as a function of the frequency of the incident light, and a linear fit is performed. The slope and the intercept of the line allow one to respectively evaluate the ratio h/e and the ratio W/e, where W is the work function of the photocathode.

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“…Por suas especificidades, gostaríamos de destacar três dos trabalhos que citam o uso da válvula 1P39 em experimentos sobre o EF. Os dois primeiros sugerem circuitos eletrônicos simples, baseados em circuitos integrados, para amplificar a fotocorrente e não mencionam a determinação da função trabalho do material do catodo [5,24]. O outro utiliza a medida da queda de tensão sobre um resistor como forma indireta de obter a fotocorrente e afirma determinar a função trabalho.…”

Section: Experimentos Sobre O Efeito Fotoelétricounclassified

“…É importante destacar que diversos autores [20,21,24] mencionam a necessidade de recobrir a válvula com uma pequena tira de material opaco, de modo a impedir que a luz incida diretamente sobre o anodo e produza a ejeção de elétrons deste eletrodo. Nós utilizamos uma tira de fita isolante, de 5 mm de largura, como se pode ver na Figura 2.…”

Section: Nossa Proposta Experimentalunclassified

Efeito fotoelétrico: desenvolvimento de umexperimento quantitativo

Alves

Santos

2021

Rev. Bras. Ensino Fís.

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A experimentação é um aspecto importante das atividades voltadas para o ensino e a aprendizagem da física. Embora se possa discutir sobre as formas como ela é implementada em sala de aula, não há dúvidas que os experimentos constituem objetos mediadores relevantes nestas atividades. Contudo, há muito que as instituições de ensino sofrem com a dificuldade para adquirir experimentos, seja pelo agravamento dos cortes nas verbas destinadas às escolas públicas, seja pelo alto custo dos equipamentos fornecidos pelas empresas de materiais para laboratório. Diante dessas dificuldades e com a necessidade de melhor equipar o laboratório de física de nossa instituição, que atende a um curso de Licenciatura em Física, elaboramos um projeto que tem por objetivo o desenvolvimento de experimentos, principalmente para as áreas de eletromagnetismo e física moderna. Os experimentos são elaborados de modo a permitir demonstrações quantitativas dos fenômenos físicos a um custo bem menor que o de versões semelhantes encontradas no mercado. Neste trabalho compartilhamos as informações sobre a construção de um aparato experimental destinado ao estudo quantitativo do efeito fotoelétrico e apresentamos também os resultados que podem ser obtidos com tal aparato.

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A direct potential measurement in the photoelectric effect experiment

Cited by 9 publications

References 0 publications

An Entropy Approach to a Practical Limit of the Efficiencies of Developed and Multijunction Solar Cells

An Entropy Approach to a Practical Limit of the Efficiencies of Developed and Multijunction Solar Cells

Measurement of the ratio h / e with a photomultiplier tube and a set of LEDs

Efeito fotoelétrico: desenvolvimento de umexperimento quantitativo

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