A spaceship is coming directly toward you while you are in the International Space Station. You are told that the spaceship is shining sodium light (with an intense yellow doublet of wavelengths 588.9950 and 589.5924 nm). You have an apparatus that can resolve two closely spaced wavelengths if the difference is Δ λ< 0.55 nm. If you fi nd that you can just resolve the doublet, how fast is the spaceship traveling with respect to you?
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