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The spectrum of a distant galaxy shows the Hα line of hydrogen (λrest = 0.656 microns)...

The spectrum of a distant galaxy shows the Hα line of hydrogen (λrest = 0.656 microns) at a wavelength of 0.9840 microns. This corresponds to a redshift of z = 0.50 and a recessional speed of vr = 0.38 c . What is the distance to this galaxy in Mly?

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