Because the analytic method tends to have many more parts, the method can take quite a bit more time to apply. Also, one must assign a point-value to every type of error made by your students, and the variety of mistakes can be staggering. The drawback to this method is that it can sometimes unfairly penalize a student who has a good understanding of the problem but makes a lot of minor errors. How the electron recoil energy relates to the change in photon energyĪ note on analytic rubrics: If you decide you feel more comfortable grading with an analytic rubric, you can assign a point value to each concept.Relationship between photon wavelength and energy.Compton scattering for photon: the relationship between the change in photon wavelength and angle of scattering (derived using energy and momentum conservation).The discovery of Compton scattering was important in the early development of Quantum Mechanics because it illustrates the quantum nature of light and cannot be correctly described using classical electromagnetism.ĭesired Traits: Conceptual Elements Needed for the Solution Understand Compton scattering and apply the concepts in a calculation. Find the equation describing the maximum recoil energy of the electron and evaluate it for E = 1 MeV. The following is a sample homework problem from a UC Berkeley Physics Department undergraduate course in quantum mechanics.Ī free electron of mass m 0 is initially at rest until a photon of energy E Compton scatters off of it. Finally, check the stacks for consistency and mark the scores. Apply the holistic rubric by marking comments and sorting the students’ assignments into stacks (e.g., five stacks if using a five-point scale). Decide what rubric you will use (e.g., holistic or analytic, and how many points). Then look at a sample of student work to get a feel for student mistakes. When starting to grade a problem, it is important to think about the relevant conceptual ingredients in the solution. Often holistic rubrics are the most efficient, consistent, and fair way to grade a problem set. In STEM disciplines (science, technology, engineering, and mathematics), assignments tend to be analytical and problem-based. Here you can see the steps used to create two kinds of rubric: one for problems in a physics exam for a small, upper-division physics course, and another for an essay assignment in a large, lower-division sociology course. Grading Rubrics: Examples of Rubric CreationĬreating a rubric takes time and requires thought and experimentation.
Faculty Advisers for GSI Affairs & Professional Developers of GSIs.Support for Pedagogy Courses for First-Time GSIs.Language & Teaching Resources for International GSIs.
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