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A Fluid Dynamics Experiment for Introductory Physics
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| Pengarang | : | Frank X. Lee |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 177-180 |
| Abstrak | : | Hands-on labs with real equipment are an integral part of the physics experience. I propose such a lab to supplement the teaching of introductory physics. In particular, I focus on a series of carefully designed activities in fluid dynamics with increasing challenge, culminating with the glug-glug phenomenon of emptying a bottle of liquid under gravity. The seemingly simple activities touch upon a surprising number of physics principles, including free fall, fluid pressure, buoyancy, the continuity equation, Bernoulli’s principle, adiabatic expansion of air, and simple harmonic motion, all of which are accessible at the introductory level. They also offer opportunities for students to explore and think deeper. The lab can be done in one session with a simple setup, requiring only some tubes and bottles, a bucket, and a mobile phone. The emphasis is on analysis, reasoning, and understanding via a variety of questions. |
Physics Intuition About Vectors Can Help Us Understand Generative Artificial Intelligence
| Pengarang | : | Tor Ole B. Odden; Audun Skau Hansen |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 173-176 |
| Abstrak | : | In physics classrooms across the United States, there hangs a classic poster, published by the American Physical Society, presenting 10 reasons why you should study physics. Of these, some are very general (physics teaches you how to think), some practical (physics gets you a job), some inspirational (physics makes things possible), and one is a joke (physics can get you out of a black hole). However, a new emerging trend now motivates us to add an 11th reason: physics prepares you to use and understand generative artificial intelligence. |
A Survey of Reversible Devices
| Pengarang | : | Christopher J. Chiaverina |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 169-172 |
| Abstrak | : | Devices such as electric motors, light-emitting diodes (LEDs), piezoelectric transducers, and Peltier cooling modules can perform more than one task. For example, applying a voltage to an LED produces light, while exposing an LED to light produces an emf. Some of the devices described here have appeared in previous issues of TPT. They are included because they exemplify versatility. |
Drama in Quantum Physics Teaching Following Uncle Albert and Alice into Quantumland
| Pengarang | : | Ann-Marie Martensson-Pendrill; Henrik Hallstrom |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 165-168 |
| Abstrak | : | Quantum mechanics has been enormously successful. The equations and rules enable accurate calculations and predictions of energies and other properties of atoms, molecules, and materials. Quantum-physics-based technology is an integrated part of our daily lives. Still, the understanding and interpretation of quantum physics offer many challenges, with the counterintuitive consequences of the rules, from the mythical “Schrödinger’s cat,” over single-photon double-slit experiments, to the Einstein–Podolsky–Rosen (EPR) paradox, formulated in 1935. |
An Introduction to Quantum Phenomena: A Conceptual Instructional Sequence
| Pengarang | : | Zac Patterson |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 161-164 |
| Abstrak | : | Quantum physics (QP) is a pivotal branch of modern physics essential for comprehending the nature of physical reality. However, its abstract concepts pose significant learning challenges in introductory physics courses. This paper proposes an evidence-based instructional sequence designed to establish a strong conceptual foundation for further exploration of quantum phenomena. The development of this sequence was informed by prior research on teaching and learning introductory QP, focusing on key topics, effective entry points, common obstacles, and successful teaching strategies. Designed to be completed in approximately 1 week or 4 hours of class time, the sequence emphasizes conceptual understanding and requires only basic algebra and geometry skills. This approach is particularly well suited for upper-level secondary students, providing them with the necessary tools to grasp the complexities of QP. |
The Implosion of the Titan Submersible: A Stress–Strain Experiment
| Pengarang | : | Gregory A. DiLisi; Steven J. Eppell; Richard A. Rarick |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 156-160 |
| Abstrak | : | Over the past several years, various articles in The Physics Teacher have shown how a forensics-style reexamination of significant historical events can be used as a motivation to introduce fundamental concepts to students in introductory physics and engineering courses.1–8 These exercises afford students the opportunity to apply basic principles of physics to explore unsolved mysteries and potentially settle historical debates. The lessons learned and best practices of these activities have been formalized into a pedagogy for teaching topics in physics, engineering, problem solving, critical thinking, and ethics.9,10 |
Extant Time Balls Around the World
| Pengarang | : | Harry Manos |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 63 (No. 3) |
| Halaman | : | 152-155 |
| Abstrak | : | Time balls offer physics teachers and students opportunities to visit world cultural centers and explore off-the-beaten-track scientific landmarks. A few of the original time balls around the world are extant and are interesting to visit. This article will feature where some of the remaining time balls may be found and provide, at the end, online sources for further information about where and how to visit them. |
Monte Carlo, blocking, and inference: How to measure the renormalization group flow
| Pengarang | : | Luca Di Carlo |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 93 (No. 2) |
| Halaman | : | 193-200 |
| Abstrak | : | Renormalization group theory is a powerful and intriguing technique with a wide range of applications. One of the main successes of renormalization group theory is the description of continuous phase transitions and the development of scaling theory. Most courses on phase transitions focus on scaling and critical exponents, while less attention is paid to universality, renormalization group flow, and the existence of a unique fixed point, which are the ultimate reasons why scaling theory is so effective in describing continuous phase transitions. We use a combination of Monte Carlo simulations and real space renormalization group theory to determine the renormalization group flow and to show the existence of a universal fixed point in the context of the ferromagnetic Ising model. |
Advanced undergraduate lab on quantum beats
| Pengarang | : | M. J. Wright; R. Beban; O. Chierchio; L. McCluney; T. Peña; J. P. St. John |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 93 (No. 2) |
| Halaman | : | 187-192 |
| Abstrak | : | Spontaneous emission has been studied by physicists for decades and continues to reveal exciting physics. We describe an experiment to study the spontaneous emission of a monoatomic vapor at room temperature as a fundamental experiment for upper-level physics undergraduates. The experiment begins by exciting a population of Rb atoms in a room temperature vapor cell with a laser pulse shorter than the average lifetime of the excited states. The resulting fluorescence signal is recorded as a function of time, and the excited state lifetime can be determined by measuring the decay rate. By analyzing the Fourier transform of the time-dependent polarized fluorescence signal, quantum interference (i.e., quantum beating) is observed among the hyperfine energy levels. This experiment can be completed by upper-level undergraduates in physics to demonstrate and connect hands-on experiments with concepts in atomic and quantum physics classes. |
A versatile Hon Ou Mandel interference experiment in optical fiber for the undergraduate laboratory
| Pengarang | : | Cyrus Bjurlin; Theresa Chmiel |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 93 (No. 2) |
| Halaman | : | 180-186 |
| Abstrak | : | Hong–Ou–Mandel (HOM) interference is a quantum optics laboratory experiment that has recently become more accessible to undergraduate students. The experiment consists of two identical photons simultaneously entering a nonpolarizing beamsplitter, where the photon wavefunctions interfere. As a result, the photon pair exits from the same beamsplitter output, whereas classically, the two photons are equally likely to exit from the two different outputs. This effect is demonstrated by observation of a dip in coincidence counts measured between the two beamsplitter outputs. Due to the precision needed to achieve photon indistinguishability, the setup and alignment of this experiment is often considered to be too difficult and time consuming to be appropriate for the undergraduate instructional laboratory. Here, we present an alternative optical-fiber-based apparatus that gives a consistently reproducible experiment. In our approach, quantum interference occurs within a fused-fiber coupler, instead of within a traditional beamsplitter. We use a commercially available fiber-coupled biphoton source that requires minimal alignment and increases the interference coherence length. In addition, our biphoton source provides direct temperature-based control of the frequency degeneracy of the photon pairs, allowing students to investigate physical properties of HOM interference such as coherence length and interference visibility. Through use of standard optomechanical parts, combined with the commercially available fiber-integrated biphoton source, our apparatus is positioned midway between a completely built-from-scratch and a pre-aligned setup, making it ideal for the advanced instructional laboratory. |