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

question 81

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 redshift? (Note that the rest wavelength of the H $\alpha$ emission line is 656.3 nm.)

• A) 0.05
• B) 0.07
• C) 0.10
• D) 0.13
• E) 0.15

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