Lect07_[Compatibility_Mode]

# Lect07_[Compatibility_Mode] - Physics 344 Foundations of...

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Physics 344 Foundations of 21 st Century Physics: Relativity, Quantum Mechanics and heir Applications Their Applications Instructor: Dr. Mark Haugan Office: PHYS 282 [email protected] TA: Dan Hartzler Office: PHYS 7 [email protected] Grader: Shuo Liu Office: PHYS 283 [email protected] Office Hours: If you have questions, just email us to make an ppointment e enjoy talking about physics! appointment. We enjoy talking about physics! Reading: Chapters 4 and 6 of the text. Notices: If you were unable to attend Tuesday’s help session in room 160, see the grader to pick up and discuss your graded homework.

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Question 1 Last lecture we considered a situation involving Jack, an observer on the ground near a straight section of train track, and Jill an observer standing at the center of a train along the track at constant speed V . Lighting struck the front (event F) and the back (event B) of the train at what Jack measures to be the same time, t F = t B = t P , where t P is the time at which Jill passes him. Jill measure the times at which events F and B happen and finds that A) they are equal, t’ F = t’ B . ) that t B) that t F > t B . C) that t’ F < t’ B . e prepared to discuss the reasons that you think your answer is correct Be prepared to discuss the reasons that you think your answer is correct.
ere is Jack’s ground- ame spacetime diagram depicting the sequence of t’ Here is Jack s ground frame spacetime diagram depicting the sequence of events. ill’s t C Jill s worldline ack ront Jack’s orldline A B Back Front worldline event B event F x event P Because Jill’s measures the locations of the events to be equidistant from her in the train-frame and because she sees light from event F first, she concludes that it must have happened first because light travels at c in all directions in her frame just as in Jack’s.

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Question 2 Jack has a collaborator, Bill, at rest on the ground who happens to be at the location in their frame of event B. He is there when the lightning strikes the back of the passing train. Bill measures the times at which events B and F happen and finds that A) they are equal. ) that event F occurred after event B B) that event F occurred after event B. C) that event F occurred before event B. e prepared to discuss the reasons that you think your answer is correct Be prepared to discuss the reasons that you think your answer is correct.
ere is Jack’s ground- ame spacetime diagram depicting the sequence of t’ Here is Jack s ground frame spacetime diagram depicting the sequence of events. ill’s t C ill’s Jill s worldline Back ront Jack’s orldline A B Bill’s worldline Front worldline event B event F x event P Bill sees light from event B immediately, and sees light from event F only much later. He is, however, at rest in Jack’s frame and must agree with is measurements of time intervals between events He checks the distance his measurements of time intervals between events. He checks the distance

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Lect07_[Compatibility_Mode] - Physics 344 Foundations of...

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