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

question 44

Multiple Choice

If you found a galaxy with an H $\alpha$ emission line that had a wavelength of 756.3 nm, what would be the galaxy's distance if the Hubble constant is 70 km/s/Mpc? (Note that the rest wavelength of the H $\alpha$ emission line is 656.3 nm.)

• A) 650 Mpc
• B) 760 Mpc
• C) 3,200 Mpc
• D) 6,400 Mpc
• E) 7,600 Mpc

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