If a galaxy has a recessional velocity of 50,000 km/s, at what wavelength will you observe the H$\alpha$ emission line? (Note that the rest wavelength of the H$\alpha$ emission line is 656.3 nm.)
A) 695.7 nm
B) 719.4 nm
C) 742.3 nm
D) 765.7 nm
E) 1,750 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 H$\alpha$ emission line? (Note that the rest wavelength of the H$\alpha$ emission line is 656.3 nm.)
A) 695.7 nm
B) 719.4 nm
C) 742.3 nm
D) 765.7 nm
E) 1,750 nm

If a Galaxy Has a Recessional Velocity of 50,000 Km/s α\alphaα

If a Galaxy Has a Recessional Velocity of 50,000 Km/s $\alpha$