发布求助
文献互助 智能选刊 最新文献

American Journal of Physics最新文献

筛选
英文 中文
Erratum: “All objects and some questions” [Am. J. Phys. 91, 819–825 (2023)] 勘误："所有物体和一些问题" [Am. J. Phys. 91, 819-825 (2023)]
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0198864
C. Lineweaver, Vihan M. Patel
{"title":"Erratum: “All objects and some questions” [Am. J. Phys. 91, 819–825 (2023)]","authors":"C. Lineweaver, Vihan M. Patel","doi":"10.1119/5.0198864","DOIUrl":"https://doi.org/10.1119/5.0198864","url":null,"abstract":"","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140092168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The uncertainty principle and quantum wave functions that are their own Fourier transforms 不确定性原理和量子波函数自身的傅立叶变换
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0162363
Keith Zengel, Nick DeVitto, Nathanael Hillyer, Jeffrey Rodden, Vinh Vu
{"title":"The uncertainty principle and quantum wave functions that are their own Fourier transforms","authors":"Keith Zengel, Nick DeVitto, Nathanael Hillyer, Jeffrey Rodden, Vinh Vu","doi":"10.1119/5.0162363","DOIUrl":"https://doi.org/10.1119/5.0162363","url":null,"abstract":"We present several variations of a proof of the position-momentum uncertainty principle that are based on the calculus of variations and does not rely on the Cauchy–Schwartz inequality. We show that the stationary uncertainty wave functions are the Hermite–Gaussian solutions to the quantum harmonic oscillator problem, that the minimum uncertainty wave function is the Gaussian, and that stationary uncertainty wave functions must be their own Fourier transforms. We also provide a calculus of variations proof of the Cauchy–Schwartz inequality. Finally, we discuss the properties of wave functions that are their own Fourier transforms and provide examples of such functions that may be of interest to teachers of undergraduate and graduate level quantum mechanics courses.","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140086647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Playing melodies on a single string by exciting harmonics using the Lorentz force 利用洛伦兹力激发谐波，在单根弦上演奏旋律
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0152828
Yukai Wei, Hao Zhu, Haotian Jiang, Quanxin Luo, Shan Lin, Junqing Li, Yu Zhang, Bibo Zhao
{"title":"Playing melodies on a single string by exciting harmonics using the Lorentz force","authors":"Yukai Wei, Hao Zhu, Haotian Jiang, Quanxin Luo, Shan Lin, Junqing Li, Yu Zhang, Bibo Zhao","doi":"10.1119/5.0152828","DOIUrl":"https://doi.org/10.1119/5.0152828","url":null,"abstract":"We show how a single metal guitar string of fixed length can produce a musical scale. The string is placed near a permanent magnet, and by applying an AC to the string at the frequency of the desired musical note, the Lorentz force creates vibrations in the string at that frequency. The tension of the string is set so that its harmonics correspond to the desired notes. A one-octave scale can be approximated by using these harmonic frequencies, allowing several melodies to be played using our non-contact monochord. This project could be adopted for demonstration or laboratory projects.","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140089828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wigner versus Stark: Connecting quantum to classical in a tunnel ionization process 维格纳与斯塔克：隧道电离过程中的量子与经典连接
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0077113
S. Yusofsani, Miroslav Kolesik
{"title":"Wigner versus Stark: Connecting quantum to classical in a tunnel ionization process","authors":"S. Yusofsani, Miroslav Kolesik","doi":"10.1119/5.0077113","DOIUrl":"https://doi.org/10.1119/5.0077113","url":null,"abstract":"We present a framework designed to illustrate the dynamics of a quantum particle tunneling from a bound state into a continuum of states under the influence of an external field. We concentrate on the question of what is the best classical-level description of the escaping particle. A toy model is constructed and investigated through complementary numerical, analytical, and approximate solutions. Issues related to the location of the apparent exit from the “quantum tunnel” are addressed in the language of Wigner trajectories and discussed in relation to the other types of solutions.","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140091175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Demonstration of the propagation of errors using resistors 利用电阻器演示误差传播
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0145005
K. Gan
{"title":"Demonstration of the propagation of errors using resistors","authors":"K. Gan","doi":"10.1119/5.0145005","DOIUrl":"https://doi.org/10.1119/5.0145005","url":null,"abstract":"We present a simple experiment to demonstrate the concept of propagation of errors by measuring resistors on printed circuit boards (PCBs). We devise a method for connecting the resistors on a PCB that allows a relatively quick measurement of 200 resistor pairs to show that the distributions of the measurement of individual resistances, as well as the total resistance, are Gaussian-distributed, as expected from the central limit theorem. The measurement demonstrates how individual uncertainties propagate to the total uncertainty. The experiment is part of a laboratory course on statistics for physics students that emphasizes the application of statistics in data analysis.","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140091124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comment on “Spectral shifts in general relativity,” [Am. J. Phys. 62(10), 903–907 (1994)] 评论 "广义相对论中的光谱移动"，[《美国物理学杂志》62（10），903-907（1994）]
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0195020
J. D. Romano, Teviet Creighton
{"title":"Comment on “Spectral shifts in general relativity,” [Am. J. Phys. 62(10), 903–907 (1994)]","authors":"J. D. Romano, Teviet Creighton","doi":"10.1119/5.0195020","DOIUrl":"https://doi.org/10.1119/5.0195020","url":null,"abstract":"","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140087673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In this issue: March 2024 本期内容2024 年 3 月
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0200617
J. Essick, Jesse Kinder, C. Marrache-Kikuchi, B. Parks, B. Cameron Reed, Todd Springer
{"title":"In this issue: March 2024","authors":"J. Essick, Jesse Kinder, C. Marrache-Kikuchi, B. Parks, B. Cameron Reed, Todd Springer","doi":"10.1119/5.0200617","DOIUrl":"https://doi.org/10.1119/5.0200617","url":null,"abstract":"","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140083692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Event-based analysis of convergence to energy equipartition 基于事件的能量等分收敛分析
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-03-01 DOI: 10.1119/5.0142173
Arnaldo Spalvieri
{"title":"Event-based analysis of convergence to energy equipartition","authors":"Arnaldo Spalvieri","doi":"10.1119/5.0142173","DOIUrl":"https://doi.org/10.1119/5.0142173","url":null,"abstract":"The paper presents a simple yet rigorous analysis of the transient of the spatial distribution of the kinetic energy of a classical ideal monoatomic dilute gas that passes from non-equilibrium to equilibrium. The proposed approach is event-based, in the sense that the evolution of the system is analyzed as a function of the random number of collisions in a given time interval. Taking a very simple yet realistic model of collision, the paper shows that collisions between atoms lead exponentially to energy equipartition.","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140091421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In this issue: February 2024 本期内容2024 年 2 月
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-02-01 DOI: 10.1119/5.0193549
J. Essick, C. Marrache-Kikuchi, B. Parks, B. C. Reed, Donald Salisbury, Keith Zengel
{"title":"In this issue: February 2024","authors":"J. Essick, C. Marrache-Kikuchi, B. Parks, B. C. Reed, Donald Salisbury, Keith Zengel","doi":"10.1119/5.0193549","DOIUrl":"https://doi.org/10.1119/5.0193549","url":null,"abstract":"","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139687831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface charge and surface current densities at material boundaries 材料边界的表面电荷和表面电流密度
IF 0.9 4区 教育学
American Journal of Physics Pub Date : 2024-02-01 DOI: 10.1119/5.0164442
Richard Marchand
{"title":"Surface charge and surface current densities at material boundaries","authors":"Richard Marchand","doi":"10.1119/5.0164442","DOIUrl":"https://doi.org/10.1119/5.0164442","url":null,"abstract":"In electromagnetism, materials with a polarization density P→ or a magnetization density M→ are known to exhibit a bound surface charge density σb=P→·n̂ or a surface current density κ→b=M→×n̂, respectively, where n̂ is the unit vector perpendicular to the material boundary surface, directed outward. These expressions can be obtained from volume integrations for the electric potential V, or the magnetic vector potential A→, in which the integrals are restricted to the material volumes delimited by their respective boundaries. In that case, applying the divergence theorem leads to surface integrals on material boundaries and to the above-mentioned surface quantities. In this paper, a simple derivation is presented, which shows that both σb and κ→b are included in the expressions for the volume charge or current densities, provided that the divergence and curl operators are evaluated at the boundary so as to account for discontinuities at interfaces.","PeriodicalId":7589,"journal":{"name":"American Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139686394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信