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A physicist arranges to trigger two flashbulbs simultaneously: a blue flash located
at the origin of her reference frame and a red flash at a distance x = 100 km in her
reference frame. A second physicist, moving a speed v = 0.5c in the direction of
increasing x also observes the two flashes. The origins of the two reference frames
coincide at t = t′ = 0, i.e. x = x′ = 0 at t = t′ = 0.
(a) What time interval between the two flashes will the second observer measure?
(b) Which flash does the second observer see happen first?
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