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Lecture 32

# Lecture 32 - Recap of last lecture Consequences of the...

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Recap of last lecture Consequences of the postulates of special relativity : 1. Speed of light is a constant 2. Simultaneity of events is frame dependent 3. Time intervals are frame dependent 4. spatial intervals (length) is frame dependent 5. Space-time interval is frame independent. (Space-time interval) 2 = (c*time-interval) 2 - (space-interval) 2

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Time Dilation Space-time interval is frame independent If the light receiver is placed at the origin of the moving frame and receives the light at time t’ Space time coordinate is (x’,t’) = (0,t’) For the observer at rest the same event occurs at (x,t) = (ut,t) Since (∆s’) 2 = (∆s) 2 therefore c 2 t’ 2 = c 2 t 2 u 2 t 2 Or t’ = t(1 -u 2 /c 2 ) 1/2 or t = g t also written as t = g t 0
Time Dilation t = g t ’; g = 1/(1 u 2 /c 2 ) 1/2

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