Doublehranch7823 Doublehranch7823

20-02-2024
Physics

contestada

What speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589.6 nm?
a) 30 km/s
b) 60 km/s
c) 90 km/s
d) 120 km/s

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