2. In the 1887 experiment by Michelson and Morley, the length of each interferometer arm was 11m. The experimental limit on the measurable fringe shift was 0.005 fringes. If sodium light was used (λ = 589nm), what upper limit did the null experiment place on the speed of the Earth through the expected ether?

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http://physicsweb.phy.uic.edu/244/Phys244notes_wk10.pdf

t1= l/ (c-v )+ l/ (c+v)

Right, so you need to find the phase difference as a function of velocity. If a river flows downstream at speed u, and I can paddle my boat and a speed c relative to the river, how long does it take me to go a distance L and back?

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