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Lecture04

Lecture04 - Physics 344 Foundations of 21 st Century...

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Unformatted text preview: Physics 344 Foundations of 21 st Century Physics: Relativistic and Quantum Systems Instructor: Dr. Mark Haugan Office: PHYS 282 [email protected] TA: Dan Hartzler Office: PHYS 7 [email protected] Grader: Fan Chen Office: PHYS 222 [email protected] Office Hours: If you have questions, just email us to make an appointment. We enjoy talking about physics! Help Session: Thursdays 2:00 – 4:00 in PHYS 154 Reading: Sections 1.1 through 1.5 and Chapter 2 in Six Ideas that Shaped Physics, Unit R. Homework 1 is due tomorrow at the beginning of your recitation session. Last Week We … predicted the motion of an electron through an accelerator: - to emphasize the role inertial coordinate systems play in making predictions. - to remind us that massive particle motion is subject to a relativistic speed limit, c . developed ways to measure the electron’s final speed: - to verify that we could test the relativistic principles we used to predict it. - to reveal the role that the speed c plays in the process of measuring the spacetime coordinates that represent events in an inertial coordinate system (clock synch). introduced spacetime diagrams: - as an effective way to display complicated sequences of events that constitute physical systems’ behavior, predicted or observed. discussed the Principle of Relativity and other symmetry principles: - to provide evidence that these principles are valid. - to make explicit the conceptual challenge represented by the frame-independent c which they imply. Q1. Each of these 2d spacetime diagrams depicts a set of events forming a line. Which of them represent possible worldlines of a massive particle? x t 1 x t 2 x t 3 x t 4 A) 1 and 2 B) 2 and 3 C) 2, 3 and 4 D) 3 and 4 E) all of them Velocity measurements focus on the relationship between pairs of “nearby” events on a particle’s worldline, x t 21 21 x x v t ∆ = ∆ 21 x ∆ 21 t ∆ e1 e2 Notice how the purely spatial displacement and the purely time displacement in this coordinate system “add up” to the displacement from e1 to e2. More on this way of thinking soon!...
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Lecture04 - Physics 344 Foundations of 21 st Century...

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