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wumple
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Homework Statement
An observer S sees a flash of red light 1200m from his position and a flash of blue light 720 m closer to him and on the same straight line. He measures the time interval between the occurrence of the flashes to be 5.0 microseconds, the red flash occurring first.
(a)What is the relative velocity v of a second observer S' who would record these flashes as occurring at the same place?
Homework Equations
x' = gamma (x - beta W) , W = ct
The Attempt at a Solution
I used the above equation and set delta x' = 0 but I came up with beta = -.32. The back says beta = .48. What did I do wrong?? Thanks in advance!