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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

Correct Answer:

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