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Neat, Adam – Physics Teacher, 2022
Gravity bends light. One can argue this by reasoning that a beam of light should travel in a curved path when viewed from within an accelerating frame of reference, and then invoking Einstein's principle of equivalence, which asserts that the effects observed in an accelerating frame of reference are indistinguishable from the effects observed in…
Descriptors: Physics, Scientific Concepts, Light, Scientific Principles
Guan-Jie Luo; Pei-Hsuan Wu; Ming-Le Lin; Fang-Fei Chou; Jim Jr-Min Lin – Journal of Chemical Education, 2023
A simple photometric device was built to measure the kinetics of the title reaction. The device consisted of a green light-emitting diode (centered at 520 nm), a sample vial, a photodiode, and an Arduino microcontroller board. These parts were mounted on a black poly(lactic acid) holder which was manufactured by utilizing three-dimensional…
Descriptors: Kinetics, Chemistry, Measurement Equipment, Color
Pinochet, Jorge – Physics Education, 2020
The objective of this second part of the work is to present heuristic derivations of the three classical tests of general relativity. These derivations are based on the Einstein equivalence principle and use Newtonian physics as a theoretical framework. The results obtained are close to Einstein's original predictions. Historical and anecdotal…
Descriptors: Physics, Scientific Concepts, Scientific Principles, Theories
Ekkens, Tom – Physics Teacher, 2022
In many introductory physics classes, diffraction of light is introduced first, then more advanced diffraction topics such as x-ray diffraction, Bragg's law, and crystallography are covered. Since using x-rays raises safety concerns and atomic spacing in a crystal is not easy to change, microwaves with macroscopic crystals have been used to study…
Descriptors: Data Collection, Physics, Science Education, Introductory Courses
Kao, W. F. – Physics Education, 2021
Fermat's principle states that a light ray refracted across different media will traverse the fastest path as the physics for Snell's law. A geometric proof of Fermat's principle will be demonstrated as an intuitive approach to learn high school geometry and physical optics. It will be proved explicitly by showing that all alternative paths need…
Descriptors: Physics, Scientific Principles, Optics, Geometry
Navalkar, Vinita; Sawant, Sumedh; Mourya, Shubham – Physics Education, 2021
The concept of black body is of primary importance in studying the energy transfer of thermal electromagnetic radiation at all wavelengths. Several physical bodies like incandescent lamps, electric heaters, stoves, the sun and the other stars, microwave background radiation, etc., are considered to be black bodies as their radiation spectra fits…
Descriptors: Energy, Radiation, Light, Physics
Hughes, Stephen; Gurung, Som – Physics Education, 2021
Huygens' principle in which every point on a propagating wave acts like a point source of radiation is a foundation principle of physics. Normally, Huygens' principle is demonstrated by passing a wave, for example a water or light wave through an aperture comparable in size to the wavelength. In this paper, an experiment is described in which a…
Descriptors: Physics, Science Instruction, Teaching Methods, Scientific Principles
Suits, B. H. – Physics Teacher, 2018
The peak position of the spectral density for blackbody radiation is given by the Wien displacement law. Within introductory physics materials it is often stated, or implied through example, that the color of the light emitted from a blackbody, such as the Sun, can be ascertained from knowledge of the position of that peak in the spectral density.…
Descriptors: Physics, Astronomy, Science Instruction, Radiation
Levanov, Alexander V.; Isaikina, Oksana Ya. – Journal of Chemical Education, 2020
Investigation of the kinetics of phosphorescence decay is a suitable learning task in studying the formal kinetics, and also properties of crystal phosphors. Kinetics of phosphorescence decay of crystal phosphors can be experimentally investigated at home as part of distance learning, using a conventional digital photo camera and a luminescent…
Descriptors: Chemistry, Science Instruction, Teaching Methods, Distance Education
Puri, Avi – Physics Education, 2016
The question in the title above is exploited to analyse the relationship between different astronomical models and frames of reference. The paper highlights the fact that the geostatic model, the favoured model in ordinary discourse, even that of scientists, is at odds with two cherished principles, that of the rectilinear propagation of light,…
Descriptors: Astronomy, Models, Scientific Principles, Light
Salinas, Isabel; Giménez, Marcos H.; Monsoriu, Juan A.; Castro-Palacio, Juan C. – Physics Teacher, 2018
The smartphone's ambient light sensor has been used in the literature to study different physical phenomena. For instance, Malus's law, which involves the polarized light, has been verified by using simultaneously the orientation and light sensors of a smartphone. The illuminance of point light sources has been characterized also using the light…
Descriptors: Physics, Handheld Devices, Light, Measurement
Yan, Peizheng; Xia, Haojie; Li, Jianquan; Wang, Yonghong; Wei, Yongqing; Ji, Feng; Shu, Shuangbao – Physics Teacher, 2019
Light polarization, which is the direction of electromagnetic field oscillation, provides information that is highly different from that of spectral and intensity images and thus can enhance various fields of optical metrology. Polarization imaging can be also used by combining polarization and imaging, thereby providing polarization and spatial…
Descriptors: Telecommunications, Handheld Devices, Light, Energy
Aji, Mahardika Prasetya; Karunawan, Jotti; Chasanah, Widyastuti Rochimatun; Nursuhud, Puji Iman; Wiguna, Pradita Ajeng; Sulhadi – Physics Education, 2017
A simple diffraction experiment was designed using banana stem as natural grating. Coherent beams of lasers with wavelengths of 632.8 nm and 532 nm that pass through banana stem produce periodic diffraction patterns on a screen. The diffraction experiments were able to measure the distances between the slit of the banana stem, i.e. d = (28.76 ±…
Descriptors: Lasers, Science Experiments, Teaching Methods, Spectroscopy
Isik, Hakan – Physics Education, 2017
This paper describes the formation of a circumzenithal arc for the purpose of teaching light and optics. A circumzenithal arc, an optic formation rarely witnessed by people, is formed in this study using a water-filled cylindrical glass illuminated by sunlight. Sunlight refracted at the top and side surfaces of the glass of water is dispersed into…
Descriptors: Geometric Concepts, Optics, Light, Science Activities
Semay, Claude; Lo Bue, Francesco; Mélin, Soizic; Michel, Francis – Physics Education, 2018
In 1849, Hippolyte Fizeau determined the speed of light in a famous experiment. The idea was to measure the time taken for a pulse of light to travel between an intense light source and a mirror about 8 km away. A rotating cogwheel with 720 notches, that could be rotated at a variable speed, was used to chop the light beam and determine the flight…
Descriptors: Physics, Measurement, Scientific Principles, Light