lecture23 101123 - 11/23/2010 Einsteins Principle of...

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11/23/2010 1 Einstein’s Principle of Relativity resolves problems without ether Postulates (1905) The Principle of Relativity : All laws of physics are the same in all inertial frames The constancy of the speed of light: the speed of light in vacuum has the same value in all inertial reference frames, regardless of the velocity of the observer or the velocity of the source emitting the light No preferred inertial reference frame exists It is impossible to detect absolute motion There is no such thing as absolute length There is no such thing as absolute time Events at different locations observed to occur simultaneously in one frame are not observed to be simultaneous in another frame moving uniformly past the first Time Dilation The train is moving to the right at speed v An observer, O’, at rest in this system, with laser emits a pulse of light directed at the mirror (event 1) and the pulse arrives back after being reflected (event 2) Observer O’ carries a clock She uses it to measure the time between the events ( t p ) The p stands for proper She observes the events to occur at the same place t p = distance/speed = (2d)/c Time Dilation-- Stationary Observer Observer O
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lecture23 101123 - 11/23/2010 Einsteins Principle of...

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