class05 - Announcements Reading for Monday: TZD 1.12 1.14...

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Announcements • Reading for Monday: TZD 1.12 – 1.14 Register your clicker! CU Speak Toastmasters Tuesdays at 7:00 PM Koelbel 308 (Leeds School of Business) WEBSITE : www.colorado.edu/studentgroups/cuspeak CONTACT : Joseph Esler (VP Public Relations) 720-675-8479 [email protected] CU Speak Toastmasters: Campus Map Today’s class • Time dilation • Space-time diagrams
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Review: Lucy in the train plays with a firecracker. Ethel watches from the track L R v Lucy Ethel They want to know what time the light reaches the left and the right ends of the car (Two ‘events’ in each frame) L R v v v v Lucy: in the train Ethel: on the platform From last class: Timing of events depend on the choice of the inertial frame!! v L R 0 0 Event L: (x=-3, t=3s) Event R: (x=+3, t=3s) Event L’: (x’=-2, t’=2s) Event R’: (x’=+5, t’=4s) x’ x Lucy says: ‘Simultaneous!’ Ethel says: ‘Not simultaneous!’ An important conclusion Given two spacetime events: 1) Light hits the right end of the train car 2) Light hits the left end of the train car Lucy finds that the events are simultaneous. Ethel (in a different reference frame) finds that they are not simultaneous. And they’re both right! v ... -3 -2 -1 0 1 2 3 ... Lucy L R Q1 Ethel Now suppose Lucy’s firecracker is just slightly toward the right end of the train, so slightly that Ethel still measures the light hitting the left end first . According to Lucy, which end gets hit first? a) both at the same time b) the left end, L c) the right end, R An important conclusion • In Lucy’s frame: – Firecracker explodes (event 1) – Light gets to the right end of the train (event R) – A little later, light gets to the left end (event L) • In Ethel’s frame:
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This note was uploaded on 08/24/2010 for the course PHYS 2130 taught by Professor Staff during the Spring '08 term at Colorado.

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class05 - Announcements Reading for Monday: TZD 1.12 1.14...

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