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

Question

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The Answer of 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

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

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