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If You Found a Galaxy with a Hydrogen Emission Line,normally

Question 21

Multiple Choice

If you found a galaxy with a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 756.3 nm,what would the galaxy's recessional velocity be if the Hubble constant is 72 km/s/Mpc?


A) 39,700 km/s
B) 45,700 km/s
C) 47,000 km/s
D) 54,500 km/s

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