As 2019 is the 150th anniversary of the Mendeleev's Periodic Table, UNESCO has proclaimed this year the International Year of the Periodic Table (IYPT2019). One of the most important steps in the evolution of the Periodic Table is the concept of atomic number, established by Moseley. In this article, his work is commented on, and the emission of…

In this study, the conceptions of pre-university level secondary students with respect to radiation and radioactivity were investigated. A literature review determined what was already known about secondary school students' conceptions that differ from scientific theory, regarding radiation and radioactivity. Next, 12 Dutch students and their…

The role of peer and teacher mediation in discussions about two original scientific texts in the final year of high school in Brazil is explored in this study. A text by James C. Maxwell, deals with the characterisation of light as an electromagnetic phenomenon, and refers to the continuous manner of the distribution of energy by radiation in…

This paper aims to introduce the initiative "Escola Sirius para Professores do Ensino Médio" (ESPEM, Sirius School for High School Teachers) hosted by the "Centro Nacional de Pesquisa em Energia e Materiais" (CNPEM, Brazilian Center for Research in Energy and Materials) and supported by the Sociedade Brasileira de Física (SBF,…

We have studied the intensity of free radical and antioxidant processes in organs (liver, spleen, thymus, lymph nodes of the small intestine, and adrenal glands) and cells (lymphocytes) in the long-term period after combined exposure to a sublethal dose of ?-radiation (6 Gy) and emotional stress. Combined exposure was followed by accumulation of…

Harmful plastic debris found on beaches and in the oceans are not limited to drinking straws or bags. There are several synthetic organic polymers that can be used to make different kinds of plastic materials and have resulted in billions of tons of waste that can reach the aquatic biome and are harmful to freshwater and marine communities as well…

Theoretical assessment of the upper limit of a star's mass is a difficult problem which lies at the frontier of astrophysical research. In this article we develop a simple and plausible argument to estimate this value. The value at which we arrive is ~228 solar masses; well within the range of predicted accepted theoretical values. Towards the end…

Atomic weapons testing during the Cold War and accidents at nuclear power plants have resulted in the release of radioactive fallout over great distances. Little is known about levels of fallout deposited in Indiana. The reported study sampled soil in all 92 Indiana counties to determine the present level of cesium-137 from the 2 to 12 centimeter…

Purpose: The aim of this paper is to distinguish pedagogies supporting critical health literacy development in adolescent populations. Specifically, for sun safety education in schools. Design/methodology/approach: The paper draws on an exploratory intrinsic case study design to qualitatively examine the learning conditions that Pre-Service…

Stars are point-source emitters that are the closest to the definition of a blackbody in comparison to all other similar sources of radiation found in nature. Existing libraries on stellar spectra are thus a valuable resource that can be used to introduce the laws of thermal radiation in a classroom setting. In this article we briefly describe…

Radiation is ever-present around us, yet there is still a lack of knowledge about radiation among the general population, especially when it comes to students. For this study, we measured the effectiveness of a lesson plan on radiation concepts that focused on ionising radiation and was supported by references and examples from the superhero…

For good science teaching, it is necessary to have knowledge of your students' preconceptions. Numerous studies have been conducted about typical ideas that students bring to the science classroom in science education research. Unfortunately the domains of which we know preconceptions are not distributed evenly and there is a lack of studies about…

For now, it is unlikely to think that developed industrial economies and high living standards can be maintained without using certain radiation sources which do not exist in nature. That is why human kind has needed to produce certain radiation sources in artificial ways as a necessity of technological development. In thepresent study, the aim is…

Radiation has become an important issue due to an increase in human-made radiation sources and a rapid improvement in technology. The aim of this study is to elicit the Turkish physics teachers' views of the 'radiation' subject in the current textbooks. To collect data, semi-structured interviews were conducted with twelve teachers working in…

Heat and temperature concepts are found at all levels in the science curricula and are well-known for creating conceptual difficulties for learners. Students have difficulty understanding concepts related to heat, temperature, and thermal radiation. Inquiry-based pedagogies that can foster the learning of these difficult concepts are needed.…