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

Options

A. `Z prop r`
B. `Z prop 1//r`
C. `Z prop 1//r^(2)`
D. `Z prop r^(3//2)`

Answer

A

Explanation

Hubble's law is a statement of a direct correclation between the distance (r ) to a galaxy and its recessional velocity as determined by the red shift (Z).
It is stated as `Z=H_(0)r`,
where Z= recessional velocity
`H_(0)=` Hubble constant and r= distance.