Question

According to Hubble's law, the redshift (Z) of a receding galaxy and its distance r from earth are related as

Answer 1

The correct option is (a).

Explanation:

Hubble's law is a statement of a direct correlation between the distance (r) to a galaxy and its recessional velocity as determined by the red shift (Z). It is stated as Z = H_or, 

where Z = recessional velocity

H_o = Hubble constant and r = distance.