PhysicsMedium84×since 2003Q8402With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 Ao\mathop A\limits^oAo is observed at 5896 Ao\mathop A\limits^oAo ?A306 km/secB322 km/secC296 km/secD336 km/secCheck answerSkip