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If You Found a Galaxy with an H α\alpha Emission Line That Had a Wavelength of 756

Question 38

Multiple Choice

If you found a galaxy with an H α\alpha emission line that had a wavelength of 756.3 nm,what would be the galaxy's distance if the Hubble constant is 22 km/s/Mly? Note that the rest wavelength of the H α\alpha emission line is 656.3 nm.


A) 1,120 km/s
B) 2,080 km/s
C) 6,070 km/s
D) 8,500 km/s

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