The difficulties associated with relativistic two-body equations, both classical and quantum mechanical, will be discussed. Two approaches to the two-body Dirac equation will then be considered. The emphasis will be on the Breit version of this equation with instantaneous interaction. This equation will be solved for quarkonium states using a standard potential with short-range and linear...
Many textbooks define the COP of a refrigerator consisting of a working fluid (taken to be an ideal gas) as the ratio of the sum $Q_C$ of all heats input to the ideal gas divided by the total work $W$ done on the ideal gas, both calculated around one complete cycle. Since the change in internal energy of the gas is zero for a (steady-state) cycle, $W$ can alternatively be written as $Q_H -...
Projectile motion is the first topic in an introductory physics course that can boggle the minds of students. It is important to start with basic observations and discussion much earlier in math, geology, or other science classes. The presentation will demonstrate how free simulations, such as PhET - [Projectile Motion][1], can be effectively used for pre-lab activities or projects in schools...
This session will present opportunities for STEM students and teachers available at Jefferson Lab — from internships, mentorships and summer programming for both high school, 2- and 4-year undergraduate students, and faculty. We will also share resources for K-12 teacher professional development and information regarding community outreach efforts and how to engage with the Lab for your events.
This session will present opportunities for STEM students and teachers available at Jefferson Lab — from internships, mentorships and summer programming for both high school, 2- and 4-year undergraduate students, and faculty. We will also share resources for K-12 teacher professional development and information regarding community outreach efforts and how to engage with the Lab for your events.
A red LED and a green LED are wired in parallel and attached to a lamp cord. The LEDs are oriented in opposite directions, so when one of them is forward biased the other is reverse biased. When plugged in to a wall outlet, at any instant only one of the LEDs will be forward biased; this switches between red and green with a 60 Hz frequency. Waving the end of the cord back and forth (or...
We teach a little modern physics in Phy 202; one topic we cover is the Heisenberg Uncertainty principle. To demonstrate the Heisenberg Uncertainty principle, we put the sound of a tuning fork through different filtering window sizes then we get the resulting spectrum. The result shows that reducing the uncertainty in time will increase the uncertainty in the frequency in accord with the...
The Centripetal Force Experiment is a standard experiment for physics student labs in which a mass is attached is rotated in a circle at different angular velocities. The mass is attached to a string that goes around a pulley and is attached a force sensor by a string over a pulley so that the length of the string to the pulley is the radius $R$ of the circular motion, and so the centripetal...
We will demonstrate the Centripetal Force Experiment in which a mass is attached is rotated in a circle at different angular velocities. The mass is attached to a string that goes around a pulley and is attached a force sensor by a string over a pulley so that the length of the string to the pulley is the radius $R$ of the circular motion, and so the centripetal force is measured. In this...
I will be presenting my recent work in redesigning Introductory physics 1 and 2 for pre-health majors at the University of Virginia by integrating biological and medical applications of the physics concepts covered in a manner that students perceive as relevant and engaging. We aim to bridge the gap between physics and biology, addressing the common issue of waning interest in learning the...
In this talk our interest is on whether we can observe, demonstrate, and perhaps measure at some level the interplay of the effects of air-drag around smooth non-spinning balls, rough balls, and spinning balls (Magnus Force) at speeds available in a classroom environment. Some of this effort came about when looking for simple aerodynamic affects that could be used in an active learning...
