If a galaxy has a recessional velocity of 50,000 km/s,at what wavelength will you observe the Hαemission line? Note that the rest wavelength of the Hα emission line is 656.3 nm.
A)695.7 nm
B)719.4 nm
C)742.3 nm
D)766.0 nm
E)1750 nm

Question

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The Answer of If a galaxy has a recessional velocity of 50,000 km/s,at what wavelength will you observe the Hαemission line? Note that the rest wavelength of the Hα emission line is 656.3 nm.
A)695.7 nm
B)719.4 nm
C)742.3 nm
D)766.0 nm
E)1750 nm

If a Galaxy Has a Recessional Velocity of 50,000 Km/s,at