Light is gathered from a distant galaxy and one of the spectral lines of Calcium is observed at 413.26 nm when it should be 393.37 nm. (a) Find the…

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Light is gathered from a distant galaxy and one of the spectral lines of Calcium is observed at 413.26 nm when it should be 393.37 nm. (a) Find the velocity of this galaxy (hint: Doppler formula). (b) Find the distance to this galaxy (hint: Hubble Law).