The CaII H and K lines have rest wavelengths of 396.85 nm and 393.36 nm, respectively. In the spectrum of a galaxy in the cluster Abell 2065, the observed wavelengths of the two lines are 425.50 nm and 421.76 nm. a) What is the redshift z of the galaxy? b) What is the distance to the galaxy? c) What is the distance modulus of the galaxy?

The CaII H and K lines have rest wavelengths of 396.85 nm and 393.36 nm, respectively. In the spectrum of a galaxy in the cluster Abell 2065, the observed wavelengths of the two lines are 425.50 nm and 421.76 nm. a) What is the redshift z of the galaxy? b) What is the distance to the galaxy? c) What is the distance modulus of the galaxy?