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Three Redshifts: Doppler, Cosmological, and Gravitational
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| Pengarang | : | Silvia Simionato |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 5) |
| Halaman | : | 333-336 |
| Abstrak | : | The concept of redshift is very often used in teaching physics and astronomy, as well as in science public outreach. Redshift is an interesting topic, used to describe many physical processes such as the Doppler effect or the expansion of the universe. Nevertheless, there are unfortunately also misconceptions about redshift. When facing the redshift topic with students and teachers, we have to focus sometimes on dissolving these misconceptions. Therefore, the idea of this paper, in which the most common misconceptions are treated, arose from direct experience and discussions with colleagues in the field. This article explains what redshift is and how it works. Moreover, since redshift has a great potential for teaching and is usable in many physics and astronomy problems, examples and specifically developed exercises are also used in this article. |
Balloon-borne Solar Radiation Measurements During the 2017 North American Eclipse
| Pengarang | : | William V. Slaton |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 5) |
| Halaman | : | 328-332 |
| Abstrak | : | Asolar eclipse provides a well-characterized reduction in solar radiation. Solar radiation is a driving factor in meteorological and climate models. Hence, solar eclipses provide a unique opportunity to do large-scale meteorological experiments by measuring the effects on temperature, pressure, and wind while the atmospheric conditions stay mostly constant as the solar radiation amount changes. An eclipse is also a good opportunity to see what happens to solar power generation. Balloon-borne sensors get you above the cloud layer, but as we shall see, they are not necessarily ideal for this type of measurement. |
Hollywood Movie Physics to Personalize Assessments
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 5) |
| Halaman | : | 325-327 |
| Abstrak | : | Have you ever taught “head on the table” physics students and wondered how to increase engagement? If so, I have two stories for you! Davon and Cynthia—both case study students—struggled with traditional physics but showed great promise with developing personalized physics problems. |
Using Universal Design for Learning to Support Students with Disabilities in a SCALE-UP Physics Course
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 5) |
| Halaman | : | 320-324 |
| Abstrak | : | Students with disabilities comprise a large and growing fraction of college students; however, many instructors lack the training and knowledge to support them. In this paper, we discuss the impact of professional development about executive function disorders and Universal Design for Learning for an introductory physics instructor (second author) and his students. |
Using Math in Physics: Overview
| Pengarang | : | Edward F. Redish |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 5) |
| Halaman | : | 314-318 |
| Abstrak | : | The key difference between math as math and math in science is that in science we blend our physical knowledge with our knowledge of math. This blending changes the way we put meaning to math and even the way we interpret mathematical equations. Learning to think about physics with math instead of just calculating involves a number of general scientific thinking skills that are often taken for granted (and rarely taught) in physics classes. In this paper, I give an overview of my analysis of these additional skills. I propose specific tools for helping students develop these skills in subsequent papers. |
Visualizing Fluid Flow Around a Baseball Using Water Instead of Air
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 5) |
| Halaman | : | 310-312 |
| Abstrak | : | The flow of air around a baseball and over the seam acts to slow the ball and to deflect it sideways. Turbulent flow can be visualized, and sideways deflection of the ball can be observed clearly if the ball is dropped in a glass fish tank and filmed with a high-speed camera. Results are presented for a baseball and also for a billiard ball with a metal ring attached to simulate the effect of the baseball seam. |
The Taut Wire Harmonograph
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 724-729 |
| Abstrak | : | George M. Hopkins (1842-1902) wrote a series of articles on demonstrating physical phenomena in the Scientific American during the last years of the 19th century. These were collected in a book, Experimental Science, that was first published in 1890, with revisions in 1892 and 1902. It must have been well received, for the 27th edition came out in 1911. When discussing the taut wire harmonograph in Fig. 1, he writes that “as incidental to scientific work, the effects of beautiful experiments on the latter class may be worth a little consideration, as it not infrequently happens that the mere onlooker is lured into the paths of science by such means.” |
ECG Voltage and Vector Analysis for Heart Axis Determination
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 720-723 |
| Abstrak | : | Often students think of ECGs (electrocardiograms) as a diagnostic tool for heart attacks. In this activity, students are able to develop an approach to examine an ECG in order to determine what is known as the mean electrical axis (MEA) of their ventricle. In doing so, they not only learn another use for ECGs, they are able to see a real-world application and gain an understanding of dipoles and of vector analysis. |
Newton’s Green and Goethe’s Purple – Color Experiments with LEDs Available to Purchase
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 712-718 |
| Abstrak | : | White light refracted by a glass edge or a prism might be split into the colors of the rainbow but, when restricted by a suitable arrangement of edges, might also yield a sequence of colors complementary to the rainbow. We studied the creation of these color fields experimentally with a setup consisting of RGB light-emitting diodes that cover all color combinations of the three primary colors red, green, and blue. These light fields were projected through a prism onto a screen or a camera to generate various color fields by refraction. Applying the rules of additive color mixing, a simple RGB model based on the slit spectrum of the light convincingly reproduces the observed color patterns. The parallel use of model and experiment enables a clear recognition of unusual spectra from particularly combined light fields and yields an explanation of their origin. |
Interference of Two Point Sources Using Smartphones
| Pengarang | : | Giovanni Organtini |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 709-711 |
| Abstrak | : | A simple experimental setup using a smartphone and a pair of speakers is presented to perform an accurate experiment on interference of two point sources. The proposed experiment allows simple but interesting measurements to be done to introduce students to interference and diffraction phenomena. As such, the experiment effectively introduces the classical Young’s double-slit interference experiment, and can be used as a replacement for the classical ripple tank. |