Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.44
P. Montero
The Fresnel and Arago interference laws relate the polarization of the electromagnetic field to the interference phenomenon. Different methods and interferometers have been reported to verify these laws; most of them rely on visual inspection to determine the positions of maximum and minimum interference. In this report, the observation and verification of the Fresnel and Arago interference laws using adaptive photodetectors are presented. These photodetectors generate an electrical current proportional to the square of the visibility of the interference pattern; thus the gradual change from the appearance of the interference pattern (maximum visibility) to its disappearance (minimum or null visibility) is detected as an electrical current. The extreme values of the interference pattern visibility can be accurately assessed, in real time and without any signal processing using. A difference of 3 orders of magnitude between the signals measured in the positions of maximum and minimum interference is demonstrated. Due to the adaptive properties of the adaptive photodetectors (compensation of the irregularities of the interfering beams and suppression environmental fluctuations), the proposed method can be suitable for teaching purposes in undergraduate laboratories.
{"title":"Observation and verification of the Fresnel and Arago interference laws using adaptive photodetectors","authors":"P. Montero","doi":"10.31349/revmexfise.18.44","DOIUrl":"https://doi.org/10.31349/revmexfise.18.44","url":null,"abstract":"The Fresnel and Arago interference laws relate the polarization of the electromagnetic field to the interference phenomenon. Different methods and interferometers have been reported to verify these laws; most of them rely on visual inspection to determine the positions of maximum and minimum interference. In this report, the observation and verification of the Fresnel and Arago interference laws using adaptive photodetectors are presented. These photodetectors generate an electrical current proportional to the square of the visibility of the interference pattern; thus the gradual change from the appearance of the interference pattern (maximum visibility) to its disappearance (minimum or null visibility) is detected as an electrical current. The extreme values of the interference pattern visibility can be accurately assessed, in real time and without any signal processing using. A difference of 3 orders of magnitude between the signals measured in the positions of maximum and minimum interference is demonstrated. Due to the adaptive properties of the adaptive photodetectors (compensation of the irregularities of the interfering beams and suppression environmental fluctuations), the proposed method can be suitable for teaching purposes in undergraduate laboratories.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"1 1","pages":"44-49"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77095051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.90
G. M. Oghlu Sharifov
The paper deals with the study of the resistance of incandescent light bulbs. It has been established that the temperature dependence of resistance for these types of lamps always manifests itself in school experiments. Therefore, students in specialized school should be taught a systematic comparison of resistance in resistors and lamps in circuits in term of didactic principles and be given a detailed explanation of the different factors that occurred in lamp circuits and were mistakenly understood as equipment errors.
{"title":"The misconceptions about the calculation of light bulb resistance in specialized school","authors":"G. M. Oghlu Sharifov","doi":"10.31349/revmexfise.18.90","DOIUrl":"https://doi.org/10.31349/revmexfise.18.90","url":null,"abstract":"The paper deals with the study of the resistance of incandescent light bulbs. It has been established that the temperature dependence of resistance for these types of lamps always manifests itself in school experiments. Therefore, students in specialized school should be taught a systematic comparison of resistance in resistors and lamps in circuits in term of didactic principles and be given a detailed explanation of the different factors that occurred in lamp circuits and were mistakenly understood as equipment errors.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"2 1","pages":"90-96"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88153737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.107
A. Tapia, R. Benavides
En este trabajo, se presenta por primera vez la implementacion del modelo 3-3-1 con neutrinos derechos sin cargas electricas exoticas en el paquete SARAH del programa MATHEMATICA, y se muestra como reproduce de manera correcta los resultados analiticos del modelo. Como prueba de ello, se presenta las matrices de masa para los sectores de quarks, donde se ha usado un sector de Higgs con tres tripletes escalares. Luego, usando el programa SPheno, se realiza un analisis numerico de las salidas analiticas obtenidas con SARAH; esto con el objetivo de determinar si el modelo con tres tripletes genera los valores de masas de todos los quarks adecuadamente al compararlos con los aceptados en la literatura. Esta implementacion es presentada de manera didactica y accesible a estudiantes que esten interesados en este campo de la fisica.
{"title":"Modelo 3-3-1 con neutrinos derechos, implentado en SARAH y SPheno","authors":"A. Tapia, R. Benavides","doi":"10.31349/revmexfise.18.107","DOIUrl":"https://doi.org/10.31349/revmexfise.18.107","url":null,"abstract":"En este trabajo, se presenta por primera vez la implementacion del modelo 3-3-1 con neutrinos derechos sin cargas electricas exoticas en el paquete SARAH del programa MATHEMATICA, y se muestra como reproduce de manera correcta los resultados analiticos del modelo. Como prueba de ello, se presenta las matrices de masa para los sectores de quarks, donde se ha usado un sector de Higgs con tres tripletes escalares. Luego, usando el programa SPheno, se realiza un analisis numerico de las salidas analiticas obtenidas con SARAH; esto con el objetivo de determinar si el modelo con tres tripletes genera los valores de masas de todos los quarks adecuadamente al compararlos con los aceptados en la literatura. Esta implementacion es presentada de manera didactica y accesible a estudiantes que esten interesados en este campo de la fisica.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"5 1","pages":"107-126"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78446272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.131
E. F. Putri, E. Purwaningsih
The flipped classroom is one of the strategies and learning models that can improve student learning outcomes. Recent research has been done to see the strengths, weaknesses, and effects of the flipped classroom on learning, but not much research has been done to see students' responses to the application of the flipped classroom in physics class in senior high. The purpose of this study is to see how students respond to the application of flipped classrooms in physics learning at the high school level. The phenomenological research design is used to examine the factors that influence research. The result showed that teachers need to be consider of several things that impact the learning process.
{"title":"Students’ view of flipped classroom in physics’ class","authors":"E. F. Putri, E. Purwaningsih","doi":"10.31349/revmexfise.18.131","DOIUrl":"https://doi.org/10.31349/revmexfise.18.131","url":null,"abstract":"The flipped classroom is one of the strategies and learning models that can improve student learning outcomes. Recent research has been done to see the strengths, weaknesses, and effects of the flipped classroom on learning, but not much research has been done to see students' responses to the application of the flipped classroom in physics class in senior high. The purpose of this study is to see how students respond to the application of flipped classrooms in physics learning at the high school level. The phenomenological research design is used to examine the factors that influence research. The result showed that teachers need to be consider of several things that impact the learning process.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"736 1","pages":"131-135"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77931339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.28
J. Natividad, H. Nuñez, P. P. Sosa
Traditionally, optical fibers have been used as communication lines and optical sensors; however, these have multiple other uses, for example, the interaction and entrapment of microparticles. This article studies the computational modelling of the propagation of light that comes out of conventional, single-mode and multimode optical fibers, which is of interest when studying the interaction of light with microparticles. As a parameter of analysis and quantification we use the degree of diffraction of the light propagation beams, at different distances from the optical fibers. Resulted intensity field distributions give us important microscopic information to consider for light interaction with such microparticles.
{"title":"Study of the propagation of a light beam at the exit of a single-mode and multimode optical fiber","authors":"J. Natividad, H. Nuñez, P. P. Sosa","doi":"10.31349/revmexfise.18.28","DOIUrl":"https://doi.org/10.31349/revmexfise.18.28","url":null,"abstract":"Traditionally, optical fibers have been used as communication lines and optical sensors; however, these have multiple other uses, for example, the interaction and entrapment of microparticles. This article studies the computational modelling of the propagation of light that comes out of conventional, single-mode and multimode optical fibers, which is of interest when studying the interaction of light with microparticles. As a parameter of analysis and quantification we use the degree of diffraction of the light propagation beams, at different distances from the optical fibers. Resulted intensity field distributions give us important microscopic information to consider for light interaction with such microparticles.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"37 1","pages":"28-34"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90799478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.127
V. Ivchenko
In this paper we derive and analyse the expressions to find the illuminance from luminous ball, disc and line in the case of general position of the light receiver. We show that one can always replace a luminous ball with a point light source located at its center and having the appropriate luminous intensity. Any luminous disc or line can be considered, with reasonable accuracy (the relative error in the determination of the illuminance is less than $5 %$ ), as the point light source with anisotropic (cosine) luminous intensity and placed at their center, if the distance to the observation point is approximately four times larger than their characteristic sizes. The issues outlined in this article will be useful for undergraduate students, who study the basics of photometry.
{"title":"Extended versus point light source: where does the difference in the illuminance exist?","authors":"V. Ivchenko","doi":"10.31349/revmexfise.18.127","DOIUrl":"https://doi.org/10.31349/revmexfise.18.127","url":null,"abstract":"In this paper we derive and analyse the expressions to find the illuminance from luminous ball, disc and line in the case of general position of the light receiver. We show that one can always replace a luminous ball with a point light source located at its center and having the appropriate luminous intensity. Any luminous disc or line can be considered, with reasonable accuracy (the relative error in the determination of the illuminance is less than $5 %$ ), as the point light source with anisotropic (cosine) luminous intensity and placed at their center, if the distance to the observation point is approximately four times larger than their characteristic sizes. The issues outlined in this article will be useful for undergraduate students, who study the basics of photometry.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"12 1","pages":"127-130"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85599580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-04DOI: 10.31349/revmexfise.18.35
S. Rojas
This article shows that in the period January 22-June 04, 2020, the combined data set of cumulative recoveries and deaths from the current coronavirus COVID-19 pandemic falls on the Kermack and McKendrick approximated solution of the epidemiological {sir} contagious disease model. Then, as an original contribution of this work, based on the knowledge of the infectious period of any epidemic, a methodology is presented that helps to find numerical solutions of the full {sir} model that falls on the observed data of the epidemic in case it could be described by the {sir} model. The methodology is first illustrated by finding a solution of the {sir} model that falls on the epidemic data of the Bombay plague of 1905-06 analyzed by Kermack and McKendrick. After that, the methodology is applied on analyzing the previously considered coronavirus COVID-19 pandemic data set. Moreover, since the Kermack and McKendrick approximated solution of the {sir} model comes from solving a Riccati type differential equation, commonly found when studying (in introductory physics courses) the vertical motion of objects on a resistive medium, enough details are given in the article so the epidemiological {sir} model can be used as an additional example for enhancing and enriching the undergraduate curriculum Physics courses for Biology, Life Sciences, Medicine and/or Computational Modeling.
{"title":"Observing the epidemiological SIR model on COVID-19 pandemic data","authors":"S. Rojas","doi":"10.31349/revmexfise.18.35","DOIUrl":"https://doi.org/10.31349/revmexfise.18.35","url":null,"abstract":"This article shows that in the period January 22-June 04, 2020, the combined data set of cumulative recoveries and deaths from the current coronavirus COVID-19 pandemic falls on the Kermack and McKendrick approximated solution of the epidemiological {sir} contagious disease model. Then, as an original contribution of this work, based on the knowledge of the infectious period of any epidemic, a methodology is presented that helps to find numerical solutions of the full {sir} model that falls on the observed data of the epidemic in case it could be described by the {sir} model. The methodology is first illustrated by finding a solution of the {sir} model that falls on the epidemic data of the Bombay plague of 1905-06 analyzed by Kermack and McKendrick. After that, the methodology is applied on analyzing the previously considered coronavirus COVID-19 pandemic data set. Moreover, since the Kermack and McKendrick approximated solution of the {sir} model comes from solving a Riccati type differential equation, commonly found when studying (in introductory physics courses) the vertical motion of objects on a resistive medium, enough details are given in the article so the epidemiological {sir} model can be used as an additional example for enhancing and enriching the undergraduate curriculum Physics courses for Biology, Life Sciences, Medicine and/or Computational Modeling.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"1 1","pages":"35-43"},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90274459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-06DOI: 10.31349/RevMexFisE.18.020208
Emmanuel Chávez Nambo, O. Sarbach
In this article, we provide a pedagogical review of the Tolman-Oppenheimer-Volkoff (TOV) equation and its solutions which describe static, spherically symmetric gaseous stars in general relativity. Our discussion starts with a systematic derivation of the TOV equation from the Einstein field equations and the relativistic Euler equations. Next, we give a proof for the existence and uniqueness of solutions of the TOV equation describing a star of finite radius, assuming suitable conditions on the equation of state characterizing the gas. We also prove that the compactness of the gas contained inside a sphere centered at the origin satisfies the well-known Buchdahl bound, independent of the radius of the sphere. Further, we derive the equation of state for an ideal, classical monoatomic relativistic gas from statistical mechanics considerations and show that it satisfies our assumptions for the existence of a unique solution describing a finite radius star. Although none of the results discussed in this article are new, they are usually scattered in different articles and books in the literature; hence it is our hope that this article will provide a self-contained and useful introduction to the topic of relativistic stellar models.
{"title":"Static spherical perfect fluid stars with finite radius in general relativity: a review","authors":"Emmanuel Chávez Nambo, O. Sarbach","doi":"10.31349/RevMexFisE.18.020208","DOIUrl":"https://doi.org/10.31349/RevMexFisE.18.020208","url":null,"abstract":"In this article, we provide a pedagogical review of the Tolman-Oppenheimer-Volkoff (TOV) equation and its solutions which describe static, spherically symmetric gaseous stars in general relativity. Our discussion starts with a systematic derivation of the TOV equation from the Einstein field equations and the relativistic Euler equations. Next, we give a proof for the existence and uniqueness of solutions of the TOV equation describing a star of finite radius, assuming suitable conditions on the equation of state characterizing the gas. We also prove that the compactness of the gas contained inside a sphere centered at the origin satisfies the well-known Buchdahl bound, independent of the radius of the sphere. Further, we derive the equation of state for an ideal, classical monoatomic relativistic gas from statistical mechanics considerations and show that it satisfies our assumptions for the existence of a unique solution describing a finite radius star. Although none of the results discussed in this article are new, they are usually scattered in different articles and books in the literature; hence it is our hope that this article will provide a self-contained and useful introduction to the topic of relativistic stellar models.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47176176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-01DOI: 10.31349/revmexfise.17.133
Enrique N. Miranda
In the statistical mechanics of quantum harmonic oscillators, the zero-point energy can either be included (Schrodinger oscillators) or omitted (Planck oscillators). For the usual results, the type of oscillator makes no difference but, looking more closely, it turns out that including or not this energy is not without consequences. A simple model is introduced that we called the modified Einstein solid (MES). In this model the frequency of the oscillators change with the volume of the solid, and this change is characterized by a certain value of the Gruneisen parameter. The specific heat is the same as in the standard Einstein model, but the pressure, equation of state and bulk modulus can be evaluated in the MES. Using Planck oscillators, the pressure shows an anomalous behavior in terms of the volume, and the bulk modulus becomes negative for certain temperature and volume values, which is physically incorrect. When Schrodinger oscillators are used, the bulk modulus is always positive. Therefore, the different behavior of both types of oscillators indicates that only Schrodinger oscillators lead to correct results.
{"title":"Schrödinger and Planck oscillators: not quite the same physics for a modified Einstein solid","authors":"Enrique N. Miranda","doi":"10.31349/revmexfise.17.133","DOIUrl":"https://doi.org/10.31349/revmexfise.17.133","url":null,"abstract":"In the statistical mechanics of quantum harmonic oscillators, the zero-point energy can either be included (Schrodinger oscillators) or omitted (Planck oscillators). For the usual results, the type of oscillator makes no difference but, looking more closely, it turns out that including or not this energy is not without consequences. A simple model is introduced that we called the modified Einstein solid (MES). In this model the frequency of the oscillators change with the volume of the solid, and this change is characterized by a certain value of the Gruneisen parameter. The specific heat is the same as in the standard Einstein model, but the pressure, equation of state and bulk modulus can be evaluated in the MES. Using Planck oscillators, the pressure shows an anomalous behavior in terms of the volume, and the bulk modulus becomes negative for certain temperature and volume values, which is physically incorrect. When Schrodinger oscillators are used, the bulk modulus is always positive. Therefore, the different behavior of both types of oscillators indicates that only Schrodinger oscillators lead to correct results.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"13 1","pages":"133-137"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73156070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-01DOI: 10.31349/revmexfise.17.138
E. L. Koo, H. Bustamante
This Addendum reports exact and complete solutions for the electromagnetic field of poloidal currents uniformly distributed on spherical toroidal surfaces, which has been a pending task of Section 3 in [1]. This result is important by itself, and also because it allows the identification of new and alternative solutions and the reasons behind them.
{"title":"Addendum to complete electromagnetic multipole expansion including toroidal moments Rev. Mex. Fis E 52 (2006) 188-197","authors":"E. L. Koo, H. Bustamante","doi":"10.31349/revmexfise.17.138","DOIUrl":"https://doi.org/10.31349/revmexfise.17.138","url":null,"abstract":"This Addendum reports exact and complete solutions for the electromagnetic field of poloidal currents uniformly distributed on spherical toroidal surfaces, which has been a pending task of Section 3 in [1]. This result is important by itself, and also because it allows the identification of new and alternative solutions and the reasons behind them.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"11238 1","pages":"138-140"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80582141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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