A Galaxy 200 Mpc from Us Has a Recessional Velocity

question 28

Multiple Choice

A galaxy 200 Mpc from us has a recessional velocity of about 14,000 km/s.If it emits radiation at a wavelength of 121 nm, how much is that wavelength shifted when we observe it?

• A)5.7 x 10^-12 m
• B)5.7 x 10^-10 m
• C)5.7 x 10^-9 m
• D)5.7 x 10^-7 m
• E)5.7 x 10^-6 m

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