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  • Slow sound: An undergraduate lab experience for critical thinking
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    David L. Sidebottom

    In a simple time of flight experiment, the speed of sound is observed to travel about 5% slower inside a corrugated irrigation pipe as compared with measurements conducted in open air. Although some theoretical understanding for this retardation is provided, the focus of this paper concerns how this finding might be incorporated into an undergraduate lab activity that challenges student understanding

    更新日期:2020-06-30
  • Teaching the electrical origins of the electrocardiogram: An introductory physics laboratory for life science students
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Catherine Hirshfeld Crouch; John W. HirshfeldJr.

    We present the design, pedagogical logic, and assessment of a laboratory and supporting materials that integrate a clinical academic cardiologist's understanding of the origins of the electrocardiogram (ECG) with a physics educator's insights into how to teach the underlying physics at the introductory level to life science students. In this article, we explain the choices made throughout the design

    更新日期:2020-06-30
  • Computer-based learning in an undergraduate physics course: Interfacing a mobile phone andmatlabto study oscillatory motion
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Ernesto Momox; Charby Ortega De Maio

    Over the past couple of decades, mobile devices have become ubiquitous items in our daily lives. Companies continuously add innovative features that make them more affordable and easy to use. This success in mobile technology has prompted educators and instructors to utilize these gadgets to boost the teaching-learning process by changing the traditional classroom to one that is interactive and engaging

    更新日期:2020-06-30
  • Can students apply the concept of “which-path” information learned in the context of Mach–Zehnder interferometer to the double-slit experiment?
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Alexandru Maries; Ryan Sayer; Chandralekha Singh

    The ability to use concepts learned in one context to solve problems in a different context (i.e., transfer of learning) is often one of the major goals of physics instruction. After all, the ability to transfer learning from one context to another is a prerequisite to recognizing the applicability of compact physical laws to a multitude of contexts and is a hallmark of expertise in physics. The majority

    更新日期:2020-06-30
  • Lorentz contraction during acceleration from one inertial frame to another
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Ashok K. Singal

    We analyze here the changes that may occur in the length of a rod due to Lorentz contraction, when the rod, initially stationary in one inertial frame, is accelerated so as to come to rest in another inertial frame. The rod that earlier appeared shorter due to the Lorentz contraction in one frame should later appear shorter in the other frame. Has the rod length been reduced during acceleration, as

    更新日期:2020-06-30
  • Bell, Bohm, and qubit: EPR remixed
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    William H. Press

    This article reviews the predictions of quantum mechanics (QM) for one- and two-particle Stern–Gerlach experiments and then frames Bell's results, which rule out hidden-variable alternatives to QM, as attempts by a skeptical Eve to fool Alice and Bob with (first example) classical probability mixtures of non-entangled quantum states and (second example) a classical hidden-variable theory. With hidden

    更新日期:2020-06-30
  • A powerful graphical display of technical information: Robert Serber's plot of physical conditions inside a nuclear explosion
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    B. Cameron Reed

    A 1943 graph depicting the time evolution of physical conditions within an exploding nuclear weapon is reconstructed and discussed. The graph is remarkable for its combination of generality, simplicity, and density of information. Analyzing how Robert Serber constructed this graph proves to be a valuable exercise for developing deeper understanding of the physics of a nuclear explosion.

    更新日期:2020-06-30
  • How would a nearby kilonova look on camera?
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Nihar Gupte; Imre Bartos

    Kilonovae are cosmic optical flashes produced in the aftermath of the merger of two neutron stars. While the typical radiant flux of a kilonova can be as high as 1034 W, they typically occur at cosmological distances, requiring meter-class or larger telescopes for their observation. Here, we explore how a kilonova would look like from the Earth if it occurred in the Solar System's backyard, 1000 light

    更新日期:2020-06-30
  • Hybrid derivation of the 1D harmonic oscillator propagator
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Marco Moriconi

    We provide an elementary derivation of the one-dimensional quantum harmonic oscillator propagator, using a mix of approaches, such as path integrals, canonical operators, and ladder operators. This way we take the best of each world, and find the propagator with as few tears as possible.

    更新日期:2020-06-30
  • Simulation study of nuclear shell model using sine basis
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    Aditi Sharma; Swapna Gora; Jithin Bhagavathi; O. S. K. S Sastri

    Single-particle energy states for a neutron and a proton are obtained by solving the time-independent Schrödinger equation for the mean-field Woods–Saxon potential along with the spin-orbit term. The wavefunctions are expanded as a linear combination of simple sine-wave basis states, which are eigenfunctions of the infinite spherical-well potential. The requisite algorithm based on matrix diagonalization

    更新日期:2020-06-30
  • An autocollimator with sub-microradian sensitivity
    Am. J. Phys. (IF 0.874) Pub Date : 2020-06-18
    N. Pelle; L. Ehinger; C. R. Zaug; W. J. Kim

    We present a simple autocollimator with sub-microradian sensitivity. To demonstrate the capabilities of our autocollimator, we study the simple harmonic motion of a cantilever beam and apply an external force to affect the cantilever's resonant frequency in the context of dynamic force microscopy. Our setup is ideal for the advanced undergraduate instructional laboratory and allows a variety of high-precision

    更新日期:2020-06-30
  • Measurement-induced decoherence and information in double-slit interference.
    Am. J. Phys. (IF 0.874) Pub Date : 2016-11-04
    Joshua Kincaid,Kyle McLelland,Michael Zwolak

    The double slit experiment provides a classic example of both interference and the effect of observation in quantum physics. When particles are sent individually through a pair of slits, a wave-like interference pattern develops, but no such interference is found when one observes which "path" the particles take. We present a model of interference, dephasing, and measurement-induced decoherence in

    更新日期:2019-11-01
  • An inexpensive programmable illumination microscope with active feedback.
    Am. J. Phys. (IF 0.874) Pub Date : 2016-09-20
    Nathan Tompkins,Seth Fraden

    We have developed a programmable illumination system capable of tracking and illuminating numerous objects simultaneously using only low-cost and reused optical components. The active feedback control software allows for a closed-loop system that tracks and perturbs objects of interest automatically. Our system uses a static stage where the objects of interest are tracked computationally as they move

    更新日期:2019-11-01
  • Flying through polytropes.
    Am. J. Phys. (IF 0.874) Pub Date : 2016-03-01
    W Dean Pesnell

    Dropping objects into a tunnel bored through Earth has been used to visualize simple harmonic motion for many years, and even imagined for use as rapid transport systems. Unlike previous studies that assumed a constant density Earth, here we calculate the fall-through time of polytropes, models of Earth's interior where the pressure varies as a power of the density. This means the fall-through time

    更新日期:2019-11-01
  • Electrical interactions in the cell: Asymmetric screening in a watery antiverse.
    Am. J. Phys. (IF 0.874) Pub Date : 2014-08-16
    T P Doerr,Yi-Kuo Yu

    The problem of electrostatics in biomolecular systems presents an excellent opportunity for cross-disciplinary science and a context in which fundamental physics is called for to answer complex questions. Due to the large density in biological cells of charged biomacromolecules such as protein factors and DNA, it is challenging to understand quantitatively the electric forces in these systems. Two

    更新日期:2019-11-01
  • Inexpensive electronics and software for photon statistics and correlation spectroscopy.
    Am. J. Phys. (IF 0.874) Pub Date : 2014-07-01
    Benjamin D Gamari,Dianwen Zhang,Richard E Buckman,Peker Milas,John S Denker,Hui Chen,Hongmin Li,Lori S Goldner

    Single-molecule-sensitive microscopy and spectroscopy are transforming biophysics and materials science laboratories. Techniques such as fluorescence correlation spectroscopy (FCS) and single-molecule sensitive fluorescence resonance energy transfer (FRET) are now commonly available in research laboratories but are as yet infrequently available in teaching laboratories. We describe inexpensive electronics

    更新日期:2019-11-01
  • A cost-efficient frequency-domain photoacoustic imaging system.
    Am. J. Phys. (IF 0.874) Pub Date : 2014-03-25
    Peter Leboulluec,Hanli Liu,Baohong Yuan

    Photoacoustic (PA) imaging techniques have recently attracted much attention and can be used for noninvasive imaging of biological tissues. Most PA imaging systems in research laboratories use the time domain method with expensive nanosecond pulsed lasers that are not affordable for most educational laboratories. Using an intensity modulated light source to excite PA signals is an alternative technique

    更新日期:2019-11-01
  • Resource Letter: LBOT-1: Laser-based optical tweezers.
    Am. J. Phys. (IF 0.874) Pub Date : 2006-09-15
    Matthew J Lang,Steven M Block

    This Resource Letter provides a guide to the literature on optical tweezers, also known as laser-based, gradient-force optical traps. Journal articles and books are cited for the following main topics: general papers on optical tweezers, trapping instrument design, optical detection methods, optical trapping theory, mechanical measurements, single molecule studies, and sections on biological motors

    更新日期:2019-11-01
  • Teaching the principles of statistical dynamics.
    Am. J. Phys. (IF 0.874) Pub Date : 2006-02-01
    Kingshuk Ghosh,Ken A Dill,Mandar M Inamdar,Effrosyni Seitaridou,Rob Phillips

    We describe a simple framework for teaching the principles that underlie the dynamical laws of transport: Fick's law of diffusion, Fourier's law of heat flow, the Newtonian viscosity law, and the mass-action laws of chemical kinetics. In analogy with the way that the maximization of entropy over microstates leads to the Boltzmann distribution and predictions about equilibria, maximizing a quantity

    更新日期:2019-11-01
  • Resource Letter ETC-1: extraterrestrial civilization.
    Am. J. Phys. (IF 0.874) Pub Date : 1989-01-01
    T B Kuiper,G D Brin

    This Resource Letter provides a guide to the literature about intelligent life beyond the human sphere of exploration. It offers a starting point for professionals and academics interested in participating in the debate about the existence of other technological civilizations or in the search for extraterrestrial intelligence (SETI). It can also serve as a reference for teaching. This Letter is not

    更新日期:2019-11-01
  • Predicting charmonium and bottomonium spectra with a quark harmonic oscillator.
    Am. J. Phys. (IF 0.874) Pub Date : 1986-11-01
    J W Norbury,F F Badavi,L W Townsend

    We present a simple application of the three-dimensional harmonic oscillator which should provide a very nice particle physics example to be presented in introductory undergraduate quantum mechanics course. The idea is to use the nonrelativistic quark model to calculate the spin-averaged mass levels of the charmonium and bottomonium spectra.

    更新日期:2019-11-01
Contents have been reproduced by permission of the publishers.
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