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The Learning Assistant (LA) Model leverages undergraduate students (LAs) as facilitators of learning. LAs work with instructors and are often in positions where they collaborate with instructors on instructional material development and implementation. LAs often have complementary expertise on the types of technology that their peers use to engage in social and academic settings. This semester, eight Catalyst Emerging Leaders, who are experienced LAs, are advising CSU faculty on how we can better support students in our classes. This work leverages what we have learned since Spring 20, what we are learning in Fall 21, with a vision toward future instructional innovations. Funded by The Partnership for College Completion, the Department of Education, and the National Science Foundation DUE# 1524829, 1911341.

AAPT WM 22

Leveraging a community of learners to envision engaging instructional spaces.

la program

peer mentoring

stem

**Making Physics More Inclusive and Eliminating Exclusionary Practices in Physics**

As a gateway discipline to STEM majors and careers, physics plays a central role in deciding who does, and who doesn't, get to discover and pursue scientific careers. Technical and scientific professionals are rewarded with economic privilege and status which affords them both social and cultural power. Therefore, social justice will be realized only when the opportunity, and the choice, to excel in physics is open to all students. The culture and practices of the physics classroom reflect the culture of physics at large, which raises the question of how our professional physics communities can embrace, rather than inadvertently repel, a diverse group of academics that can help improve physics culture.  To this end, the 2021 Physics Education Research Conference will focus on defining inclusive spaces and practices. Additionally, we will explore strategies for eliminating exclusionary practices in our classrooms, research spaces, and professional organizations. We call on the community to propose sessions that will drive conversations related to these initiatives throughout PERC 2021.

Please download the full program [here. ](https://drive.google.com/file/d/1TRMC_SYJ3PUqXyP7sskA7LRSA8ow0eRE/view?usp=sharing)

PERC SM 21

August 4, 2021 - August 5, 2021 in a Virtual Conference Format

Making Physics More Inclusive and Eliminating Exclusionary Practices in Physics

poster

This meeting is a great opportunity to explore sessions and workshops designed with your professional development in mind. Present your research and exchange ideas on the latest in teaching and pedagogy. Participate in a wide range of events, activities, plenaries, and so much more, connecting you with peers and colleagues who share your commitment to excellence in physics education.

Most people likely think of learning the constellations of the night sky when they think of planetariums, but that’s not going to help you teach physics; It may not even really be astronomy, but more like sky geography; I think it’s important to teach astronomy and physics whenever possible, and planetariums can help with so much more than just constellations; Planetariums can do things that regular classrooms cannot do. This in-dome presentation will look at both specific and general ways that planetariums can help you teach physics and astronomy.

Planetarium Potentials

The STEP UP project (STEPUPphysics.org) was designed to reduce barriers for high school women in physics and encourage them to pursue an undergraduate physics degree, in which women have been underrepresented historically. STEP UP focuses on implementing high school interventions by recruiting high school physics teachers, called Advocates, who are trained to teach STEP UP’s research-driven materials in their classroom. To understand the effects of material implementation on Advocates, surveys are being administered to them before and after the school year. Using a “tempered radicals” framing, this talk will present an analysis of initial survey responses describing the characteristics of teachers who are willing to be disruptive in order to reduce barriers for women and change the physics classroom culture. Results will inform our understanding of teachers and the ways in which we can support their development as tempered radicals.

Identifying Tempered Radicals in the STEP UP Advocate Program

The 2021 Inclusive Curriculum in Physics Workshop Series is a three part series organized and led by the National Society of Black Physicists, the National Society of Hispanic Physicists, and the American Association of Physics Teachers. The series leverages the expertise of equity, diversity and inclusion (EDI) experts, as well as an organizing team of physics students, faculty and STEM professionals at different stages of their studies and careers.The purpose of the series is to: Explore the importance of EDI in the classroom and the existing instructional materials that focus on EDI, with members of the broad physics education community; Engage participants in discussion and action items around the current challenges to equity in STEM education with input from experts in the field; Provide support to working groups through a network of partners to engage in specific physics education projects using the lens of inclusion.

The 2021 Inclusive Curriculum in Physics Workshop Series

In Advanced Lab classes, students often perform labs on radioactivity and nuclear spectroscopy as well as labs measuring several fundamental constants. Advanced labs classes can pose a problem for smaller public institutions as these classes usually have low enrollments and having multiple traditional lab setups is costly. However, advances in digital electronics have enabled the development of low cost ($2000), easy to use nuclear spectroscopy systems that can provide multiple lab activities. In addition to the traditional radioactivity and shielding labs, these systems can also be used with exempt radioactive sources to provide other laboratory activities including measuring to around 5%: 1) the charge of an electron using x-ray fluorescence and 2) the mass of an electron using Compton scattering. This eliminates the need for additional laboratory equipment making such labs more accessible to both undergraduate institutions and high schools.

A Simple Nuclear Lab To Measure The Electron's Rest Mass

It is customary to introduce students to quantum mechanics with the Schrödinger equation because the single-component wave function is easy to handle mathematically. However, the Schrödinger equation is not consistent with special relativity, nor does it describe spin angular momentum. We propose that the Dirac equation provides a better introduction because (1) it is consistent with the laws of physics, (2) it describes spin angular momentum, and (3) it is easily derived from the classical physics model of an ideal elastic solid. The resultant description of classical wave mechanics shares many features of relativistic quantum mechanics. These include Lorentz invariance, bispinor wave functions, half-integer azimuthal quantum numbers, standing waves with circular wave propagation, particle classifications similar to fermions and bosons, operators for physical quantities including spin angular momentum, Pauli exclusion principle, and interaction via potentials. The Schrödinger equation approximates the evolution of a single wave function component.

Relativistic Wave Mechanics for Undergraduates

A free Gaussian can be thought of as the ground state of a simple harmonic oscillator with the frequency adjusted to give the initial variance of the Gaussian. The free Hamiltonian, when expressed in terms of the raising and lowering operators, can be thought of as a squeezing operator acting on the SHO ground state. We show how this mapping can be used to understand the increasing variance of the Gaussian as it evolves in time. In cases where time evolution is taught after the operator method solution of the SHO, then one can explain free expansion in this alternative framework. One can even perform the calculation using only operator manipulations, instead of solving the time-dependent Schroedinger equation. We sketch how this is done. It requires the Weyl form of the BCH formula, the Hadamard lemma, and the exponential disentangling identity. This work was an REU project.

Free expansion of a Gaussian via squeezed harmonic oscillator states

One advantage of using Open Education Resources is increased flexibility in pedagogical strategies. If learning materials are restricted to publisher-derived content, instructors are forced to model their teaching methodologies around those resources. Thus,instructors are unable to utilize alternative resources if they “compete” with publisher content or would overwhelm students. This is especially true with respect to institutions that standardize content across course sections, and any deviation is considered inappropriate. OER allows instructors at community colleges to tailor learning materials to the local demographics and state-wide observations. This project's OER laboratories will allow faculty to choose and customize their learning materials. Many of Chattanooga State's students are from traditionally underrepresented backgrounds (e.g. Pell-eligible, minority race, non-traditional/returning students, and academically underprepared), many introductory astronomy students will benefit from decreased course costs. This presentation is our flagship laboratory on Expansion of the Universe and utilizes coding, spectroscopy and mathematical methods.

Expansion of the Universe: an OER approach to Hubble's Constant

Geometric Optics labs are a staple of many undergraduate physics labs. A simple but effective optics bench was developed to distribute for at-home optics labs during Spring 2020 and Spring 2021. The materials for the lab included three 38mm lenses (one concave, two convex), a PVC coupling, play-doh, used holiday light bulbs, and a few other common household items. The total cost for each set-up was only $10 - $15, making this a great option when the cost of a full optics bench is not feasible. These at-home experiments were just as effective as in-person versions used in previous years. In this poster, a full description of the lab set-up is described.

An optics bench for geometric optics experiments on a budget

I describe the sequential development of an interactive Desmos visualization of Fermat's Principle of Least Time. Upon applying the principle by a manual search and by a Desmos calculation, we numerically verify Snell's Law of Refraction and the Law of Reflection. I feel this helps make this abstract physical concept more accessible to students. Along the way, I will share some Desmos tricks that I learned in the process of creating such visualizations.

Using Desmos to Visualize Fermat's Principle of Least Time

Since 2014, I have worked with students at Siena College to develop and maintain a website, Particle Physics Playground, that shares simplified datasets from real experiments with teachers and students alike. Python is the preferred way of accessing these data and Jupyter notebooks, hosted on Google's Colab platorm, allow users to get up and running seconds. These exercises have been used at the high-school and college level, both for classroom education and training of new research students, both at Siena and elsewhere. Students can learn about relativistic kinematics through hands-on activities, while developing their python programming skills. This poster will give an overview of the website content as well as future plans.

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